bs Genomic Investigation Reveals Contaminated Detergent as the Source of an Extended-Spectrum-{beta}-Lactamase-Producing Klebsiella michiganensis Outbreak in a Neonatal Unit [Bacteriology] By jcm.asm.org Published On :: 2020-04-23T08:00:29-07:00 Klebsiella species are problematic pathogens in neonatal units and may cause outbreaks, for which the sources of transmission may be challenging to elucidate. We describe the use of whole-genome sequencing (WGS) to investigate environmental sources of transmission during an outbreak of extended-spectrum-β-lactamase (ESBL)-producing Klebsiella michiganensis colonizing neonates. Ceftriaxone-resistant Klebsiella spp. isolated from neonates (or their mothers) and the hospital environment were included. Short-read sequencing (Illumina) and long-read sequencing (MinION; Oxford Nanopore Technologies) were used to confirm species taxonomy, to identify antimicrobial resistance genes, and to determine phylogenetic relationships using single-nucleotide polymorphism profiling. A total of 21 organisms (10 patient-derived isolates and 11 environmental isolates) were sequenced. Standard laboratory methods identified the outbreak strain as an ESBL-producing Klebsiella oxytoca, but taxonomic assignment from WGS data suggested closer identity to Klebsiella michiganensis. Strains isolated from multiple detergent-dispensing bottles were either identical or closely related by single-nucleotide polymorphism comparison. Detergent bottles contaminated by K. michiganensis had been used for washing milk expression equipment. No new cases were identified once the detergent bottles were removed. Environmental reservoirs may be an important source in outbreaks of multidrug-resistant organisms. WGS, in conjunction with traditional epidemiological investigation, can be instrumental in revealing routes of transmission and guiding infection control responses. Full Article
bs Direct Determination of Pyrazinamide (PZA) Susceptibility by Sputum Microscopic Observation Drug Susceptibility (MODS) Culture at Neutral pH: the MODS-PZA Assay [Mycobacteriology and Aerobic Actinomycetes] By jcm.asm.org Published On :: 2020-04-23T08:00:28-07:00 Pyrazinamide (PZA) is considered the pivot drug in all tuberculosis treatment regimens due to its particular action on the persistent forms of Mycobacterium tuberculosis. However, no drug susceptibility test (DST) is considered sufficiently reliable for routine application. Although molecular tests are endorsed, their application is limited to known PZA resistance associated mutations. Microbiological DSTs for PZA have been restricted by technical limitations, especially the necessity for an acidic pH. Here, for the first time, MODS culture at neutral pH was evaluated using high PZA concentrations (400 and 800 μg/ml) to determine PZA susceptibility directly from sputum samples. Sputum samples were cultured with PZA for up to 21 days at 37°C. Plate reading was performed at two time points: R1 (mean, 10 days) and R2 (mean, 13 days) for each PZA concentration. A consensus reference test, composed of MGIT-PZA, pncA sequencing, and the classic Wayne test, was used. A total of 182 samples were evaluated. The sensitivity and specificity for 400 μg/ml ranged from 76.9 to 89.7 and from 93.0 to 97.9%, respectively, and for 800 μg/ml ranged from 71.8 to 82.1 and from 95.8 to 98.6%, respectively. Compared to MGIT-PZA, our test showed a similar turnaround time (medians of 10 and 12 days for PZA-sensitive and -resistant isolates, respectively). In conclusion, MODS-PZA is presented as a fast, simple, and low-cost DST that could complement the MODS assay to evaluate resistance to the principal first-line antituberculosis drugs. Further optimization of test conditions would be useful in order to increase its performance. Full Article
bs Negative Nasopharyngeal and Oropharyngeal Swabs Do Not Rule Out COVID-19 [Letter To The Editor] By jcm.asm.org Published On :: 2020-04-23T08:00:28-07:00 Full Article
bs Fourier Transform Infrared Spectroscopy Is a New Option for Outbreak Investigation: a Retrospective Analysis of an Extended-Spectrum-Beta-Lactamase-Producing Klebsiella pneumoniae Outbreak in a Neonatal Intensive Care Unit [Epidemiology] By jcm.asm.org Published On :: 2020-04-23T08:00:28-07:00 The IR Biotyper is a new automated typing system based on Fourier-transform infrared (FT-IR) spectroscopy that gives results within 4 h. We aimed (i) to use the IR Biotyper to retrospectively analyze an outbreak of extended-spectrum beta-lactamase-producing Klebsiella pneumoniae (ESBL-KP) in a neonatal intensive care unit and to compare results to BOX-PCR and whole-genome sequencing (WGS) results as the gold standard and (ii) to assess how the cutoff values used to define clusters affect the discriminatory power of the IR Biotyper. The sample consisted of 18 isolates from 14 patients. Specimens were analyzed in the IR Biotyper using the default analysis settings, and spectra were analyzed using OPUS 7.5 software. The software contains a feature that automatically proposes a cutoff value to define clusters; the cutoff value defines up to which distance the spectra are considered to be in the same cluster. Based on FT-IR, the outbreak represented 1 dominant clone, 1 secondary clone, and several unrelated clones. FT-IR results, using the cutoff value generated by the accompanying software after 4 replicates, were concordant with WGS for all but 1 isolate. BOX-PCR was underdiscriminatory compared to the other two methods. Using the cutoff value generated after 12 replicates, the results of FT-IR and WGS were completely concordant. The IR Biotyper can achieve the same typeability and discriminatory power as genome-based methods. However, to attain this high performance requires either previous, strain-dependent knowledge about the optimal technical parameters to be used or validation by a second method. Full Article
bs Checking responses of goal- and sign-trackers are differentially affected by threat in a rodent analog of obsessive-compulsive disorder [RESEARCH] By learnmem.cshlp.org Published On :: 2020-04-15T06:30:12-07:00 In obsessive–compulsive disorder (OCD), functional behaviors such as checking that a door is locked become dysfunctional, maladaptive, and debilitating. However, it is currently unknown how aversive and appetitive motivations interact to produce functional and dysfunctional behavior in OCD. Here we show a double dissociation in the effects of anxiogenic cues and sensitivity to rewarding stimuli on the propensity to develop functional and dysfunctional checking behavior in a rodent analog of OCD, the observing response task (ORT). While anxiogenic manipulations of perceived threat (presentation of threat-associated contextual cues) and actual threat (punishment of incorrect responding on the ORT) enhanced functional checking, dysfunctional checking was unaffected. In contrast, rats that had previously been identified as "sign-trackers" on an autoshaping task—and therefore were highly sensitive to the incentive salience of appetitive environmental cues—selectively showed elevated levels of dysfunctional checking under a range of conditions, but particularly so under conditions of uncertainty. These data indicate that functional and dysfunctional checking are dissociable and supported by aversive and appetitive motivational processes, respectively. While functional checking is modulated by perceived and actual threat, dysfunctional checking recruits appetitive motivational processes, possibly akin to the "incentive habits" that contribute to drug-seeking in addiction. Full Article
bs Delineating the role of membrane blebs in a hybrid mode of cancer cell invasion in three-dimensional environments [RESEARCH ARTICLE] By jcs.biologists.org Published On :: 2020-04-28T08:24:46-07:00 Asja Guzman, Rachel C. Avard, Alexander J. Devanny, Oh Sang Kweon, and Laura J. Kaufman The study of cancer cell invasion in 3D environments in vitro has revealed a variety of invasive modes, including amoeboid migration, characterized by primarily round cells that invade in a protease- and adhesion-independent manner. Here, we delineate a contractility-dependent migratory mode of primarily round breast cancer cells that is associated with extensive integrin-mediated extracellular matrix (ECM) reorganization that occurs at membrane blebs, with bleb necks sites of integrin clustering and integrin-dependent ECM alignment. We show that the spatiotemporal distribution of blebs and their utilization for ECM reorganization is mediated by functional β1 integrin receptors and other components of focal adhesions. Taken together, the work presented here characterizes a migratory mode of primarily round cancer cells in complex 3D environments and reveals a fundamentally new function for membrane blebs in cancer cell invasion. Full Article
bs High cytomegalovirus serology and subsequent COPD-related mortality: a longitudinal study By openres.ersjournals.com Published On :: 2020-04-27T00:30:10-07:00 Background Positive serology for cytomegalovirus (CMV) has been associated with all-cause mortality risk but its role in COPD mortality is unknown. The objective of the present study was to assess the relationship between CMV serology and COPD mortality. Methods We analysed data from 806 participants in the Tucson Epidemiological Study of Airway Obstructive Disease who, at enrolment, were aged 28–70 years and had completed lung function tests. We tested CMV serology in sera from enrolment and defined "high CMV serology" as being in the highest tertile. Vital status, date and cause of death were assessed through death certificates and/or linkage with the National Death Index up to January 2017. The association of CMV serology with all-cause and cause-specific mortality risk was tested in Cox models adjusted for age, sex, level of education, body mass index, smoking status and pack-years. Results High CMV serology was marginally associated with all-cause mortality (p=0.071) but the effect was inversely dependent on age, with the association being much stronger among participants <55 years than among participants ≥55 years at enrolment (p-value for CMV-by-age interaction <0.001). Compared with low CMV serology, high CMV serology was associated with mortality from COPD among all subjects (adjusted hazard ratio (HR) 2.38, 95% CI 1.11–5.08; p=0.025) and particularly in subjects <55 years old at enrolment (HR 5.40, 95% CI 1.73–16.9; p=0.004). Consistent with these results, high CMV serology also predicted mortality risk among subjects who already had airflow limitation at enrolment (HR 2.10, 95% CI 1.20–3.68; p=0.009). Conclusions We report a strong relationship between CMV serology and the risk of dying from COPD, and thus identify a novel risk factor for COPD mortality. Full Article
bs National Surgical, Obstetric, and Anesthesia Plans Supporting the Vision of Universal Health Coverage By ghspjournal.org Published On :: 2020-04-27T17:00:31-07:00 Full Article
bs Iron absorption from supplements is greater with alternate day than with consecutive day dosing in iron-deficient anemic women By www.haematologica.org Published On :: 2020-05-01T00:05:41-07:00 In iron-depleted women without anemia, oral iron supplements induce an increase in serum hepcidin (SHep) that persists for 24 hours, decreasing iron absorption from supplements given later on the same or next day. Consequently, iron absorption from supplements is highest if iron is given on alternate days. Whether this dosing schedule is also beneficial in women with iron-deficiency anemia (IDA) given high-dose iron supplements is uncertain. The primary objective of this study was to assess whether, in women with IDA, alternate-day administration of 100 and 200 mg iron increases iron absorption compared to consecutive-day iron administration. Secondary objectives were to correlate iron absorption with SHep and iron status parameters. We performed a cross-over iron absorption study in women with IDA (n=19; median hemoglobin 11.5 mg/dL; mean serum ferritin 10 mg/L) who received either 100 or 200 mg iron as ferrous sulfate given at 8 AM on days 2, 3 and 5 labeled with stable iron isotopes 57Fe, 58Fe and 54Fe; after a 16-day incorporation period, the other labeled dose was given at 8 AM on days 23, 24 and 26 (days 2, 3 and 5 of the second period). Iron absorption on days 2 and 3 (consecutive) and day 5 (alternate) was assessed by measuring erythrocyte isotope incorporation. For both doses, SHep was higher on day 3 than on day 2 (P<0.001) or day 5 (P<0.01) with no significant difference between days 2 and 5. Similarly, for both doses, fractional iron absorption (FIA) on days 2 and 5 was 40-50% higher than on day 3 (P<0.001), while absorption on day 2 did not differ significantly from day 5. There was no significant difference in the incidence of gastrointestinal side effects comparing the two iron doses (P=0.105). Alternate day dosing of oral iron supplements in anemic women may be preferable because it sharply increases FIA. If needed, to provide the same total amount of iron with alternate day dosing, twice the daily target dose should be given on alternate days, as total iron absorption from a single dose of 200 mg given on alternate days was approximately twice that from 100 mg given on consecutive days (P<0.001). In IDA, even if hepatic hepcidin expression is strongly suppressed by iron deficiency and erythropoietic drive, the intake of oral iron supplements leads to an acute hepcidin increase for 24 hours. The study was funded by ETH Zürich, Switzerland. This study has been registered at www.clinicaltrials.gov as #NCT03623997. Full Article
bs Severe treatment-refractory T-cell-mediated immune skin toxicities observed with obinutuzumab/rituximab-atezo-pola in two patients with follicular lymphoma By www.haematologica.org Published On :: 2020-05-01T00:05:42-07:00 Full Article
bs Brief interventions for obesity when patients are asked to pay for weight loss treatment: an observational study in primary care with an embedded randomised trial By bjgp.org Published On :: 2020-04-30T16:04:41-07:00 BackgroundA brief intervention whereby GPs opportunistically facilitate an NHS-funded referral to a weight loss programme is clinically and cost-effective.AimTo test the acceptability of a brief intervention and attendance at a weight loss programme when GPs facilitate a referral that requires patients to pay for the service.Design and settingAn observational study of the effect of a GP encouraging attendance at a weight loss programme requiring self-payment in the West Midlands from 16 October 2018 to 30 November 2018, to compare with a previous trial in England in which the service was NHS-funded.MethodSixty patients with obesity who consecutively attended primary care appointments received an opportunistic brief intervention by a GP to endorse and offer a referral to a weight loss programme at the patient’s own expense. Participants were randomised to GPs who either stated the weekly monetary cost of the programme (basic cost) or who compared the weekly cost to an everyday discretionary item (cost comparison). Participants were subsequently asked to report whether they had attended a weight loss programme.ResultsOverall, 47% of participants (n = 28) accepted the referral; 50% (n = 15) in the basic cost group and 43% (n = 13) in the cost comparison group. This was significantly less than in a previous study when the programme was NHS-funded (77%, n = 722/940; P<0.0001). Most participants reported the intervention to be helpful/very helpful and appropriate/very appropriate (78%, n = 46/59 and 85%, n = 50/59, respectively) but scores were significantly lower than when the programme was NHS-funded (92% n = 851/922 and 88% n = 813/922, respectively; P = 0.004). One person (2%) attended the weight loss programme, which is significantly lower than the 40% of participants who attended when the programme was NHS-funded (P<0.0001).ConclusionGP referral to a weight loss programme that requires patients to pay rather than offering an NHS-funded programme is acceptable; however, it results in almost no attendance. Full Article
bs Effect of an Interactive Website to Engage Patients in Advance Care Planning in Outpatient Settings [Original Research] By www.annfammed.org Published On :: 2020-03-09T14:00:11-07:00 PURPOSE Online programs may help to engage patients in advance care planning in outpatient settings. We sought to implement an online advance care planning program, PREPARE (Prepare for Your Care; http://www.prepareforyourcare.org), at home and evaluate the changes in advance care planning engagement among patients attending outpatient clinics. METHODS We undertook a prospective before-and-after study in 15 primary care clinics and 2 outpatient cancer centers in Canada. Patients were aged 50 years or older (primary care) or 18 years or older (cancer care) and free of cognitive impairment. They used the PREPARE website over 6 weeks, with reminders sent at 2 or 4 weeks. We used the 55-item Advance Care Planning Engagement Survey, which measures behavior change processes (knowledge, contemplation, self-efficacy, readiness) on 5-point scales and actions relating to substitute decision makers, quality of life, flexibility for the decision maker, and asking doctors questions on an overall scale from 0 to 21; higher scores indicate greater engagement. RESULTS In total, 315 patients were screened and 172 enrolled, of whom 75% completed the study (mean age = 65.6 years, 51% female, 35% had cancer). The mean behavior change process score was 2.9 (SD 0.8) at baseline and 3.5 (SD 0.8) at follow-up (mean change = 0.6; 95% CI, 0.49-0.73); the mean action measure score was 4.0 (SD 4.9) at baseline and 5.2 (SD 5.4) at follow-up (mean change = 1.2; 95% CI, 0.54-1.77). The effect size was moderate (0.75) for the former and small (0.23) for the latter. Findings were similar in both primary care and cancer care populations. CONCLUSIONS Implementation of the online PREPARE program in primary care and cancer care clinics increased advance care planning engagement among patients. Full Article
bs Microbial Diversity in Deep-Subsurface Hot Brines of Northwest Poland: from Community Structure to Isolate Characteristics [Geomicrobiology] By aem.asm.org Published On :: 2020-05-05T08:00:35-07:00 Deep-subsurface hot brines in northwest Poland, extracted through boreholes reaching 1.6 and 2.6 km below the ground surface, were microbiologically investigated using culture-independent and culture-dependent methods. The high-throughput sequencing of 16S rRNA gene amplicons showed a very low diversity of bacterial communities, which were dominated by phyla Proteobacteria and Firmicutes. Bacterial genera potentially involved in sulfur oxidation and nitrate reduction (Halothiobacillus and Methylobacterium) prevailed in both waters over the sulfate reducers ("Candidatus Desulforudis" and Desulfotomaculum). Only one archaeal taxon, affiliated with the order Thermoplasmatales, was detected in analyzed samples. Bacterial isolates obtained from these deep hot brines were closely related to Bacillus paralicheniformis based on the 16S rRNA sequence similarity. However, genomic and physiological analyses made for one of the isolates, Bacillus paralicheniformis strain TS6, revealed the existence of more diverse metabolic pathways than those of its moderate-temperature counterpart. These specific traits may be associated with the ecological adaptations to the extreme habitat, which suggest that some lineages of B. paralicheniformis are halothermophilic. IMPORTANCE Deep-subsurface aquifers, buried thousands of meters down the Earth’s crust, belong to the most underexplored microbial habitats. Although a few studies revealed the existence of microbial life at the depths, the knowledge about the microbial life in the deep hydrosphere is still scarce due to the limited access to such environments. Studying the subsurface microbiome provides unique information on microbial diversity, community structure, and geomicrobiological processes occurring under extreme conditions of the deep subsurface. Our study shows that low-diversity microbial assemblages in subsurface hot brines were dominated by the bacteria involved in biogeochemical cycles of sulfur and nitrogen. Based on genomic and physiological analyses, we found that the Bacillus paralicheniformis isolate obtained from the brine under study differed from the mesophilic species in the presence of specific adaptations to harsh environmental conditions. We indicate that some lineages of B. paralicheniformis are halothermophilic, which was not previously reported. Full Article
bs Association between media attention and presentation of vaccination information on Canadian chiropractors websites: a prospective mixed-methods cohort study By www.cmajopen.ca Published On :: 2020-05-05T05:00:14-07:00 Background: Historically, some chiropractors have been critical of vaccination, and this has been the subject of recent media attention in Canada. We explored the association between media attention and public dissemination of vaccination information on Canadian chiropractors’ websites. Methods: In 2016, we identified all Canadian chiropractors’ websites that provided information on vaccination by extracting details from the regulatory college website for each province using the search engine on their "find a chiropractor" page. We assessed the quality of information using the Web Resource Rating Tool (scores range from 0% [worst] to 100% [best]), determined whether vaccination was portrayed in a positive, neutral or negative manner, and conducted thematic analysis of vaccination content. We revisited all identified websites in 2019 to explore for changes to posted vaccination material. Results: In July 2016, of 3733 chiropractic websites identified, 94 unique websites provided information on vaccination: 59 (63%) gave negative messaging, 19 (20%) were neutral and 16 (17%) were positive. The quality of vaccination content on the websites was generally poor, with a median Web Resource Rating Tool score of 19%. We identified 4 main themes: there are alternatives to vaccination, vaccines are harmful, evidence regarding vaccination and health policy regarding vaccination. From 2012 to 2016, there was 1 Canadian newspaper story concerning antivaccination statements by chiropractors, whereas 51 news articles were published on this topic between 2017 and 2019. In April 2019, 45 (48%) of the 94 websites we had identified in 2016 had removed all vaccination content or had been discontinued. Interpretation: In 2016, a minority of Canadian chiropractors provided vaccination information on their websites, the majority of which portrayed vaccination negatively. After substantial national media attention, about half of all vaccination material on chiropractors’ websites was removed within several years. Full Article
bs Proportion of female recipients of resident-selected awards across Canada from 2000 to 2018: a retrospective observational study By www.cmajopen.ca Published On :: 2020-04-06T05:19:07-07:00 Background: Female physicians have been shown to receive fewer awards from medical societies than their male colleagues. We examined the sex distribution of recipients of Canadian residency association awards. Methods: We conducted a retrospective observational study of the sex of staff and resident physician recipients of resident-selected awards from provincial and national residency associations using data from 2000–2018. We classified awards into professionalism, advocacy and wellness awards, and education and teaching awards based on award names and descriptions, and compared the proportion of male and female recipients in these categories. Results: We identified 314 recipients of staff physician awards and 129 recipients of resident physician awards. Male staff and resident physicians had higher odds of receiving awards than their female counterparts (odds ratio [OR] 1.45, 95% confidence interval [CI] 1.13–1.89 and OR 1.70, 95% CI 1.18–2.46, respectively). There was a reduction in the odds of male residents’ receiving an award over the study period (OR 0.94, 95% CI 0.90–0.98). Male physicians had higher odds of receiving education and teaching awards than female physicians as staff but not as residents (OR 3.21, 95% CI 1.72–5.95 and OR 1.96, 95% CI 0.84–4.60, respectively). Interpretation: Male staff and resident physicians in Canada had higher odds of receiving awards from provincial and national residency associations between 2000 and 2018 than their female counterparts. Given this disparity, it would be prudent for organizations that distribute awards to physicians, residents and medical students to examine their nomination criteria and processes for potential bias. Full Article
bs Systems Analysis Implicates WAVE2 Complex in the Pathogenesis of Developmental Left-Sided Obstructive Heart Defects By www.basictranslational.onlinejacc.org Published On :: 2020-04-27T11:00:20-07:00 Genetic variants are the primary driver of congenital heart disease (CHD) pathogenesis. However, our ability to identify causative variants is limited. To identify causal CHD genes that are associated with specific molecular functions, the study used prior knowledge to filter de novo variants from 2,881 probands with sporadic severe CHD. This approach enabled the authors to identify an association between left ventricular outflow tract obstruction lesions and genes associated with the WAVE2 complex and regulation of small GTPase-mediated signal transduction. Using CRISPR zebrafish knockdowns, the study confirmed that WAVE2 complex proteins brk1, nckap1, and wasf2 and the regulators of small GTPase signaling cul3a and racgap1 are critical to cardiac development. Full Article
bs "ERS International Congress 2019: highlights from Best Abstract awardees". Lorna E. Latimer, Marieke Duiverman, Mahmoud I. Abdel-Aziz, Gulser Caliskan, Sara M. Mensink-Bout, Alberto Mendoza-Valderrey, Aurelien Justet, Junichi Omura, Karthi Srika By breathe.ersjournals.com Published On :: 2020-03-18T06:44:39-07:00 Full Article
bs Screening for obstructive sleep apnoea in professional drivers By breathe.ersjournals.com Published On :: 2020-03-18T06:44:39-07:00 Professional drivers show a higher prevalence of obstructive sleep apnoea (OSA) compared with the general population. Furthermore, there is concern about the association between OSA and car crash risk given that drivers with OSA show an increased risk for car accidents. Despite this risk, OSA is often underdiagnosed and undertreated in this population, mainly due to lack of appropriate screening and sleep study referrals. Polysomnography (PSG), the gold standard test, is inappropriate for systematic screening because of its high expense, complexity and relative inaccessibility in this population. Therefore, there is a strong demand for good screening tools, including both subjective and objective data that may assist in early identification of possible OSA among professional drivers and, thus, aid in PSG examination referral and OSA management in an accredited sleep centre. However, there is considerable disagreement over screening methods and criteria for triggering a sleep study referral in different countries. There is also a strong need for further research in the area of OSA screening of commercial drivers in order to improve the diagnostic accuracy of screening tools and ensure that patients with OSA are accurately identified. Key points Obstructive sleep apnoea (OSA) is often undiagnosed and undertreated in professional drivers. Professional drivers often under-report and are reluctant to report OSA symptoms. Barriers to OSA diagnosis include appropriate screening and sleep study referrals. Screening tools including both subjective and objective data may assist in early identification of possible OSA among professional drivers. Educational aims To evaluate screening instruments currently used to identify OSA risk in professional drivers. To provide guidance for developing an assessment strategy for OSA by professional driver medical examiners. Full Article
bs Synergistic Interactions of Indole-2-Carboxamides and {beta}-Lactam Antibiotics against Mycobacterium abscessus [Mechanisms of Action] By aac.asm.org Published On :: 2020-04-21T08:01:10-07:00 New drugs or therapeutic combinations are urgently needed against Mycobacterium abscessus. Previously, we demonstrated the potent activity of indole-2-carboxamides 6 and 12 against M. abscessus. We show here that these compounds act synergistically with imipenem and cefoxitin in vitro and increase the bactericidal activity of the β-lactams against M. abscessus. In addition, compound 12 also displays synergism with imipenem and cefoxitin within infected macrophages. The clinical potential of these new drug combinations requires further evaluation. Full Article
bs Role of Arginine 214 in the Substrate Specificity of OXA-48 [Mechanisms of Resistance] By aac.asm.org Published On :: 2020-04-21T08:01:10-07:00 Increasing numbers of variants of the carbapenem-hydrolyzing class D β-lactamase OXA-48 are identified in Enterobacterales worldwide. Among them, OXA-181 and OXA-232 are of particular interest, as they differ from each other by a single amino acid substitution at position 214 (R in OXA-181 and S in OXA-232) that results in reduced carbapenem-hydrolyzing activity for OXA-232. To investigate the role of amino acid position 214 (AA214), the X-ray structure of OXA-232 was determined and AA214 of OXA-48 and of OXA-232 was replaced by G, L, D, E, S, R, and K using site-directed mutagenesis. These mutants were phenotypically characterized, and three mutants of OXA-232 were purified to study their steady-state kinetic properties. The X-ray structure of OXA-232 along with molecular modeling studies showed that the interaction via a salt bridge between R214 and D159 in OXA-48 is not possible with the G214 or S214 mutation. In contrast, with K214, which is also positively charged, the interaction with D159 is maintained. With the E214 mutant, an alternative binding conformation of imipenem that is not compatible with a nucleophilic attack by S70 was evidenced. Thus, imipenem has a very poor apparent affinity for the E214 mutant because of its nonproductive binding mode. Similarly, we could explain the lack of temocillin hydrolysis by the OXA-232-S214E mutant, which is due to the unfavorable interaction between the negatively charged R1 substituent of temocillin with the E214 residue. Overall, we demonstrate that AA214 in OXA-48-like β-lactamases is critical for the carbapenemase activity. Full Article
bs A Novel Inhaled Dry-Powder Formulation of Ribavirin Allows for Efficient Lung Delivery in Healthy Participants and Those with Chronic Obstructive Pulmonary Disease in a Phase 1 Study [Antiviral Agents] By aac.asm.org Published On :: 2020-04-21T08:01:10-07:00 Chronic obstructive pulmonary disease (COPD) is an inflammatory lung condition, causing progressive decline in lung function leading to premature death. Acute exacerbations in COPD patients are predominantly associated with respiratory viruses. Ribavirin is a generic broad-spectrum antiviral agent that could be used for treatment of viral respiratory infections in COPD. Using the Particle Replication In Nonwetting Templates (PRINT) technology, which produces dry-powder particles of uniform shape and size, two new inhaled formulations of ribavirin (ribavirin-PRINT-CFI and ribavirin-PRINT-IP) were developed for efficient delivery to the lung and to minimize bystander exposure. Ribavirin-PRINT-CFI was well tolerated in healthy participants after single dosing and ribavirin-PRINT-IP was well tolerated in healthy and COPD participants after single and repeat dosing. Ribavirin-PRINT-CFI was replaced with ribavirin-PRINT-IP since the latter formulation was found to have improved physicochemical properties and it had a higher ratio of active drug to excipient per unit dose. Ribavirin concentrations were measured in lung epithelial lining fluid in both healthy and COPD participants and achieved target concentrations. Both formulations were rapidly absorbed with approximately dose proportional pharmacokinetics in plasma. Exposure to bystanders was negligible based on both the plasma and airborne ribavirin concentrations with the ribavirin-PRINT-IP formulation. Thus, ribavirin-PRINT-IP allowed for an efficient and convenient delivery of ribavirin to the lungs while minimizing systemic exposure. Further clinical investigations would be required to demonstrate ribavirin-PRINT-IP antiviral characteristics and impact on COPD viral-induced exacerbations. (The clinical trials discussed in this study have been registered at ClinicalTrials.gov under identifiers NCT03243760 and NCT03235726.) Full Article
bs Comparison of Commensal and Clinical Isolates for Diversity of Plasmids in Escherichia coli and Klebsiella pneumoniae [Epidemiology and Surveillance] By aac.asm.org Published On :: 2020-04-21T08:01:09-07:00 In this study, the plasmid content of clinical and commensal strains was analyzed and compared. The replicon profile was similar in both populations, except for L, M, A/C, and N (detected only in clinical strains) and HI1 (only in commensal strains). Although I1 and F were the most frequent replicons, only IncI1, sequence type 12 (ST12) was associated with blaCMY-2 in both populations. In contrast, the widespread resistant IncF plasmids were not linked to a single epidemic plasmid. Full Article
bs Molecular and Clinical Characterization of Multidrug-Resistant and Hypervirulent Klebsiella pneumoniae Strains from Liver Abscess in Taiwan [Epidemiology and Surveillance] By aac.asm.org Published On :: 2020-04-21T08:01:09-07:00 Hypervirulent Klebsiella pneumoniae strains are the major cause of liver abscesses throughout East Asia, and these strains are usually antibiotic susceptible. Recently, multidrug-resistant and hypervirulent (MDR-HV) K. pneumoniae strains have emerged due to hypervirulent strains acquiring antimicrobial resistance determinants or the transfer of a virulence plasmid into a classic MDR strain. In this study, we characterized the clinical and microbiological properties of K. pneumoniae liver abscess (KPLA) caused by MDR-HV strains in Taiwan. Patients with community onset KPLA were retrospectively identified at Taipei Veterans General Hospital during January 2013 to May 2018. Antimicrobial resistance mechanisms, capsular types, and sequence types were determined. MDR-HV strains and their parental antimicrobial-susceptible strains further underwent whole-genome sequencing (WGS) and in vivo mice lethality tests. Thirteen MDR-HV strains were identified from a total of 218 KPLA episodes. MDR-HV strains resulted in similar outcomes to antimicrobial-susceptible strains. All MDR-HV strains were traditional hypervirulent clones carrying virulence capsular types. The major resistance mechanisms were the overexpression of efflux pumps and/or the acquisition of ESBL or AmpC β-lactamase genes. WGS revealed that two hypervirulent strains had evolved to an MDR phenotype due to mutation in the ramR gene and the acquisition of an SHV-12-bearing plasmid, respectively. Both these MDR-HV strains retained high virulence compared to their parental strains. The spread of MDR-HV K. pneumoniae strains in the community raises significant public concerns, and measures should be taken to prevent the further acquisition of carbapenemase and other resistance genes among these strains in order to avoid the occurrence of untreatable KPLA. Full Article
bs ISEcp1-Mediated Transposition Leads to Fosfomycin and Broad-Spectrum Cephalosporin Resistance in Klebsiella pneumoniae [Mechanisms of Resistance] By aac.asm.org Published On :: 2020-04-21T08:01:09-07:00 A fosfomycin-resistant and carbapenemase (OXA-48)-producing Klebsiella pneumoniae isolate was recovered, and whole-genome sequencing revealed ISEcp1-blaCTX-M-14b tandemly inserted upstream of the chromosomally encoded lysR-fosA locus. Quantitative evaluation of the expression of lysR and fosA genes showed that this insertion brought a strong hybrid promoter leading to overexpression of the fosA gene, resulting in fosfomycin resistance. This work showed the concomitant acquisition of resistance to broad-spectrum cephalosporins and fosfomycin due to a single genetic event. Full Article
bs ARGONAUT II Study of the In Vitro Activity of Plazomicin against Carbapenemase-Producing Klebsiella pneumoniae [Mechanisms of Resistance] By aac.asm.org Published On :: 2020-04-21T08:01:09-07:00 Plazomicin was tested against 697 recently acquired carbapenem-resistant Klebsiella pneumoniae isolates from the Great Lakes region of the United States. Plazomicin MIC50 and MIC90 values were 0.25 and 1 mg/liter, respectively; 680 isolates (97.6%) were susceptible (MICs of ≤2 mg/liter), 9 (1.3%) intermediate (MICs of 4 mg/liter), and 8 (1.1%) resistant (MICs of >32 mg/liter). Resistance was associated with rmtF-, rmtB-, or armA-encoded 16S rRNA methyltransferases in all except 1 isolate. Full Article
bs Cancer Labs Pivot to Battle COVID-19 [News in Depth] By cancerdiscovery.aacrjournals.org Published On :: 2020-05-01T00:05:26-07:00 As cancer researchers shutter their labs to comply with COVID-19–related work restrictions, some are turning their attention, resources, and technical know-how to the challenge of tackling the deadly coronavirus. Full Article
bs Daily Time of Radiation Treatment Is Associated with Subsequent Oral Mucositis Severity during Radiotherapy in Head and Neck Cancer Patients By cebp.aacrjournals.org Published On :: 2020-05-01T00:05:36-07:00 Background: Limited treatment options are available for oral mucositis, a common, debilitating complication of cancer therapy. We examined the association between daily delivery time of radiotherapy and the severity of oral mucositis in patients with head and neck cancer. Methods: We used electronic medical records of 190 patients with head and neck squamous cell carcinoma who completed radiotherapy, with or without concurrent chemotherapy, at Roswell Park Comprehensive Cancer Center (Buffalo, NY) between 2015 and 2017. Throughout a 7-week treatment course, patient mouth and throat soreness (MTS) was self-reported weekly using a validated oral mucositis questionnaire, with responses 0 (no) to 4 (extreme). Average treatment times from day 1 until the day before each mucositis survey were categorized into seven groups. Multivariable-adjusted marginal average scores (LSmeans) were estimated for the repeated- and maximum-MTS, using a linear-mixed model and generalized-linear model, respectively. Results: Radiation treatment time was significantly associated with oral mucositis severity using both repeated-MTS (n = 1,156; P = 0.02) and maximum-MTS (n = 190; P = 0.04), with consistent patterns. The severity was lowest for patients treated during 8:30 to <9:30 am (LSmeans for maximum-MTS = 2.24; SE = 0.15), increased at later treatment times and peaked at early afternoon (11:30 am to <3:00 pm, LSmeans = 2.66–2.71; SEs = 0.16/0.17), and then decreased substantially after 3 pm. Conclusions: We report a significant association between radiation treatment time and oral mucositis severity in patients with head and neck cancer. Impact: Although additional studies are needed, these data suggest a potential simple treatment time solution to limit severity of oral mucositis during radiotherapy without increasing cost. Full Article
bs Projected Reductions in Absolute Cancer-Related Deaths from Diagnosing Cancers Before Metastasis, 2006-2015 By cebp.aacrjournals.org Published On :: 2020-05-01T00:05:36-07:00 Background: New technologies are being developed for early detection of multiple types of cancer simultaneously. To quantify the potential benefit, we estimated reductions in absolute cancer–related deaths that could occur if cancers diagnosed after metastasis (stage IV) were instead diagnosed at earlier stages. Methods: We obtained stage-specific incidence and survival data from the Surveillance, Epidemiology, and End Results Program for 17 cancer types for all persons diagnosed ages 50 to 79 years in 18 geographic regions between 2006 and 2015. For a hypothetical cohort of 100,000 persons, we estimated cancer-related deaths under assumptions that cancers diagnosed at stage IV were diagnosed at earlier stages. Results: Stage IV cancers represented 18% of all estimated diagnoses but 48% of all estimated cancer-related deaths within 5 years. Assuming all stage IV cancers were diagnosed at stage III, 51 fewer cancer-related deaths would be expected per 100,000, a reduction of 15% of all cancer-related deaths. Assuming one third of metastatic cancers were diagnosed at stage III, one third diagnosed at stage II, and one third diagnosed at stage I, 81 fewer cancer-related deaths would be expected per 100,000, a reduction of 24% of all cancer-related deaths, corresponding to a reduction in all-cause mortality comparable in magnitude to eliminating deaths due to cerebrovascular disease. Conclusions: Detection of multiple cancer types earlier than stage IV could reduce at least 15% of cancer-related deaths within 5 years, affecting not only cancer-specific but all-cause mortality. Impact: Detecting cancer before stage IV, including modest shifts to stage III, could offer substantial population benefit. Full Article
bs Washing Buffer (0.1 M NaCl PBS) By cshprotocols.cshlp.org Published On :: 2020-05-01T06:29:31-07:00 Full Article
bs Elution Buffer (0.4 M NaCl PBS) By cshprotocols.cshlp.org Published On :: 2020-05-01T06:29:31-07:00 Full Article
bs Reliability of CT Angiography in Cerebral Vasospasm: A Systematic Review of the Literature and an Inter- and Intraobserver Study [INTERVENTIONAL] By www.ajnr.org Published On :: 2020-04-09T06:30:48-07:00 BACKGROUND AND PURPOSE: Computed tomography angiography offers a non-invasive alternative to DSA for the assessment of cerebral vasospasm following subarachnoid hemorrhage but there is limited evidence regarding its reliability. Our aim was to perform a systematic review (Part I) and to assess (Part II) the inter- and intraobserver reliability of CTA in the diagnosis of cerebral vasospasm. MATERIALS AND METHODS: In Part I, articles reporting the reliability of CTA up to May 2018 were systematically searched and evaluated. In Part II, 11 raters independently graded 17 arterial segments in each of 50 patients with SAH for the presence of vasospasm using a 4-category scale. Raters were additionally asked to judge the presence of any moderate/severe vasospasm (≥ 50% narrowing) and whether findings would justify augmentation of medical treatment or conventional angiography ± balloon angioplasty. Four raters took part in the intraobserver reliability study. RESULTS: In Part I, the systematic review revealed few studies with heterogeneous vasospasm definitions. In Part II, we found interrater reliability to be moderate at best ( ≤ 0.6), even when results were stratified according to specialty and experience. Intrarater reliability was substantial ( > 0.6) in 3/4 readers. In the per arterial segment analysis, substantial agreement was reached only for the middle cerebral arteries, and only when senior raters’ judgments were dichotomized (presence or absence of ≥50% narrowing). Agreement on the medical or angiographic management of vasospasm based on CTA alone was less than substantial ( ≤ 0.6). CONCLUSIONS: The diagnosis of vasospasm using CTA alone was not sufficiently repeatable among observers to support its general use to guide decisions in the clinical management of patients with SAH. Full Article
bs Cách nào để liên kết website By batdongsan.com.vn Published On :: Tue, 03 Jul 2018 16:19:52 GMT Cho tôi hỏi có thể liên kết giữa bài đăng tin trong website của công ty mình với bên phía công ty đựơc không? Full Article
bs BSEB: जानिए कब जारी होगा बिहार बोर्ड के दसवीं कक्षा का रिजल्ट? कॉपियों की मूल्यांकन प्रक्रिया है जारी By www.amarujala.com Published On :: Sat, 09 May 2020 08:51:23 +0530 बिहार बोर्ड के दसवीं कक्षा की कॉपियों का मूल्यांकन कार्य तेजी से चल रहा है। कॉपियों के मूल्यांकन कार्य की तेजी को देखते हुए कहा जा रहा है कि विद्यार्थियों को अब दसवीं परीक्षा के रिजल्ट के लिए ज्यादा इंतजार नहीं करना पड़ेगा। Full Article
bs Piaggio Vespa VXL 149 और SXL 149 BS6 इंजन के साथ भारत में लॉन्च, जानें कीमत और फीचर्स By www.amarujala.com Published On :: Tue, 05 May 2020 10:22:39 +0530 भारत में स्कूटर सेगमेंट में कई खिलाड़ी मौजूद हैं। देश में सबसे लोकप्रिय स्कूटर बेशक Honda Activa (होंडा एक्टिवा) है, लेकिन इस सेगमेंट में TVS (टीवीएस), Hero (हीरो), Yamaha (यामाहा) जैसे अन्य ब्रांड्स की भी खासी मौजूदगी है। Full Article
bs Robots are taking manufacturing jobs but making firms more productive By www.newscientist.com Published On :: Fri, 21 Feb 2020 13:02:54 +0000 Robots are replacing manufacturing workers in France, making companies more productive and reducing employment across the industry Full Article
bs Despite Record Streaming Subscriptions, Disney Is Tiptoeing Around the Cinema Drama – For Now By feedproxy.google.com Published On :: Fri, 08 May 2020 20:00:05 +0000 As a very ugly standoff develops between legacy cinemas and legacy studios, Disney appears to be playing its cards close to its chest. Full Article
bs Premier League clubs scared 50 players could revolt and put stop to Project Restart plans By feedproxy.google.com Published On :: Sat, 09 May 2020 00:00:00 +0100 Premier League clubs are fearful that a significant number of first-team stars may refuse to return to action if the league's Project Restart plan gets the green light. Full Article
bs BSF: हेड कॉन्स्टेबल के पदों पर भर्ती परीक्षा के परिणाम जारी, ऐसे कर सकते हैं चेक By www.amarujala.com Published On :: Thu, 07 May 2020 05:40:04 +0530 सीमा सुरक्षा बल ने आज, 7 मई, 2020 को बीएसएफ हेड कांस्टेबल रिजल्ट 2020 घोषित किया है Full Article
bs Want a Really Hard Machine Learning Problem? Try Agriculture, Says John Deere Labs By feedproxy.google.com Published On :: Fri, 04 Oct 2019 14:52:00 GMT John Deere, the nearly 200-year-old tractor manufacturer, now considers itself a software company Full Article robotics robotics/artificial-intelligence
bs Cerebras Unveils First Installation of Its AI Supercomputer at Argonne National Labs By feedproxy.google.com Published On :: Tue, 19 Nov 2019 13:00:00 GMT Argonne will use the CS-1 to help discover cancer therapies and understand colliding blackholes Full Article computing computing/hardware
bs AI and the Future of Work: The Prospects for Tomorrow’s Jobs By feedproxy.google.com Published On :: Tue, 03 Dec 2019 18:30:00 GMT MIT conference considers companies that have implemented job-friendly AI Full Article robotics robotics/artificial-intelligence
bs BSNL ने ग्राहकों को दिया बड़ा तोहफा, Free में मिलेगा 4G सिम कार्ड By www.amarujala.com Published On :: Sat, 09 May 2020 05:57:38 +0530 BSNL का यह ऑफर सिर्फ 90 दिनों के लिए है और ऑफर की शुरुआत एक अप्रैल से हो चुकी है। BSNL का यह ऑफर सभी सर्किल के लिए उपलब्ध है। आप किसी भी स्टोर पर जाकर अपना पुराना 2जी या 3जी सिम दे सकते हैं और नया 4जी सिम कार्ड ले सकते हैं। Full Article
bs RPGCast – Episode 343: “Mad Libs” By feedproxy.google.com Published On :: Sat, 28 Mar 2015 20:41:39 +0000 Please go ahead and download _____ to your _____. You can hear about how Anna is _____ because _____ is delayed. Chris is looking _____... Full Article News Podcasts RPG Cast
bs RPGCast – Episode 357: “Subscribe If You Like, Download If You Don’t” By feedproxy.google.com Published On :: Sat, 22 Aug 2015 19:04:49 +0000 Manny teaches us 20 girls Chinese. Anna Marie plays through the best games of the past decade. Chris plays more WoW, and…oh…what’s that? Clicker Heroes... Full Article News Podcasts RPG Cast
bs Police stop fewer black drivers at night when a 'veil of darkness' obscures their race By www.sciencedaily.com Published On :: Thu, 07 May 2020 09:46:21 EDT After analyzing 95 million traffic stop records, filed by officers with 21 state patrol agencies and 35 municipal police forces from 2011 to 2018, researchers concluded that 'police stops and search decisions suffer from persistent racial bias.' Full Article
bs Obama Slams Dropping of Michael Flynn Case, Calls White House COVID-19 Response 'Absolute Chaotic Disaster': Report By www.newsweek.com Published On :: Sat, 09 May 2020 07:02:27 -0400 Audio of a private conversation shows the 44th president's unvarnished views about the former national security adviser's case and the White House's COVID-19 response. Full Article
bs Jobs Report Reveals Racial Inequality in Unemployment at an Historic Low, Thanks to Pandemic By www.newsweek.com Published On :: Sat, 09 May 2020 11:19:00 -0400 More than 20 million Americans lost their jobs in the last month, and unemployment among African-Americans has hit 16.7 percent. Full Article
bs NASA’s Neil Gehrels Swift Observatory Tracks Water Loss from Interstellar Comet 2I/Borisov By feedproxy.google.com Published On :: Wed, 06 May 2020 17:25:22 +0000 Astronomers using NASA’s Neil Gehrels Swift Observatory have tracked water loss from 2I/Borisov, the first known interstellar comet to visit our Solar System, as it approached and rounded the Sun. Their findings were published in the Astrophysical Journal Letters. 2I/Borisov was detected on August 30, 2019 by Gennady Borisov, an astronomer at the Crimean Astrophysical [...] Full Article Astronomy 2I/Borisov Comet Hydroxyl Interstellar comet Interstellar object Milky Way NASA Solar System Swift spacecraft UV Water
bs Juno, Hubble, Gemini Observatory Probe Jovian Storm Systems By feedproxy.google.com Published On :: Fri, 08 May 2020 13:51:45 +0000 Multiwavelength observations from the NASA/ESA Hubble Space Telescope and Gemini Observatory combined with close-up views from NASA’s Juno spacecraft reveal that lightning strikes and huge storm systems that create them in Jupiter’s atmosphere are formed in and around large convective cells over deep clouds of water ice and liquid; the observations also confirm that dark [...] Full Article Astronomy Featured Atmosphere Cloud ESA Gas giant Gemini Observatory Great Red Spot Hubble IR Juno Jupiter Lightning NASA Planet Radio signal Solar System Storm
bs Silence of the Lambs Sequel Series 'Clarice' Officially Ordered at CBS By www.ign.com Published On :: Sat, 9 May 2020 15:02:50 +0000 Kal Penn and The Walking Dead's Michael Cudlitz join Lecter-less sequel show. Full Article