Federal officials have updated the number of patients in an outbreak of E. coli O157:H7 infections traced to slivered onions on McDonald’s Quarter Pounder hamburgers. The patient count now stands at 104. The Food and Drug Administration and the Centers for Disease Control and Prevention are continuing to investigate the... Continue Reading

At least 104 people have been sickened, with 34 hospitalized, in an outbreak of E. coli food poisoning tied to onions served on McDonald's Quarter Pounder hamburgers, federal health officials said Wednesday.

Boss Chris Kempczinski says sorry for the outbreak as the burger giant faces flagging sales.

Infections were reported between Sept. 27 and Oct. 11, in Colorado, Iowa, Kansas, Missouri, Montana, Nebraska, Oregon, Utah, Wisconsin, and Wyoming.

The post Deadly E. coli outbreak linked to McDonald’s Quarter Pounders sickens 49 people in 10 states appeared first on Boston.com.

It may not feel like it when the worst stomach flu of your life has you in its grip, but often, the best thing to do when you have E. coli is to rest and keep drinking beverages with electrolytes.

Boris Macek
Feb 1, 2008; 7:299-307
Research

RecQ family helicases are highly conserved from bacteria to humans and have essential roles in maintaining genome stability. Mutations in three human RecQ helicases cause severe diseases with the main features of premature aging and cancer predisposition. Most RecQ helicases shared a conserved domain arrangement which comprises a helicase core, an RecQ C-terminal domain, and an auxiliary element helicase and RNaseD C-terminal (HRDC) domain, the functions of which are poorly understood. In this study, we systematically characterized the roles of the HRDC domain in E. coli RecQ in various DNA transactions by single-molecule FRET. We found that RecQ repetitively unwinds the 3'-partial duplex and fork DNA with a moderate processivity and periodically patrols on the ssDNA in the 5'-partial duplex by translocation. The HRDC domain significantly suppresses RecQ activities in the above transactions. In sharp contrast, the HRDC domain is essential for the deep and long-time unfolding of the G4 DNA structure by RecQ. Based on the observations that the HRDC domain dynamically switches between RecA core- and ssDNA-binding modes after RecQ association with DNA, we proposed a model to explain the modulation mechanism of the HRDC domain. Our findings not only provide new insights into the activities of RecQ on different substrates but also highlight the novel functions of the HRDC domain in DNA metabolisms.

Slivered onions served on McDonald's Quarter Pounders and other menu items caused a recent E. coli outbreak, the U.S. Centers for Disease Control and Prevention announced Wednesday.

Title: Strain of E. Coli Spread From Poultry to People, Study Suggests
Category: Health News
Created: 8/30/2018 12:00:00 AM
Last Editorial Review: 8/31/2018 12:00:00 AM

Title: CDC Investigating E. coli Outbreak in Ohio, Michigan
Category: Health News
Created: 8/18/2022 12:00:00 AM
Last Editorial Review: 8/19/2022 12:00:00 AM

Title: Wendy's Pulls Lettuce Due to E. Coli Outbreak
Category: Health News
Created: 8/22/2022 12:00:00 AM
Last Editorial Review: 8/22/2022 12:00:00 AM

Title: 84 People Now Sickened in E. Coli Outbreak Tied to Wendy's Restaurant Lettuce
Category: Health News
Created: 8/26/2022 12:00:00 AM
Last Editorial Review: 8/26/2022 12:00:00 AM

Certain strains of E. coli are capable of causing severe disease, by rapidly spreading through the human digestive system, wreaking havoc throughout the bloodstream, and eventually damaging the delicate kidneys. That's the situation right now during a large outbreak in Alberta, with hundreds of children now affected.

Federal officials are investigating a new outbreak of E. coli O121:H19. A source of the pathogen has not yet been identified. The investigation is in its early stages, and 33 patients have been discovered. The Food and Drug Administration has not released any patient information, such as where the patients... Continue Reading

NEW YORK – Moves by major US fast-food chains to temporarily scrub fresh onions off their menus on Oct 24, after the vegetable was named as the likely source of an E. coli outbreak at McDonald’s, laid bare the recurring nightmare for restaurants: Produce is a bigger problem for restaurants to keep free of contamination than beef. Onions are likely the culprit in the McDonald’s E. coli outbreak across the Midwest and some Western states that has sickened 49 people and killed one, the US Department of Agriculture said late on Oct 23. The company pulled the Quarter Pounder off its menu at one-fifth of its 14,000 US restaurants. In past years, beef patties dominated the dockets of food-borne-illness lawyers, before US federal health regulators cracked down on beef contamination after an E. coli outbreak linked to Jack in the Box burgers hospitalised more than 170 people across states and killed four. As a result, beef-related outbreaks became much rarer, experts say.

NEW YORK — McDonald's on Sunday (Oct 27) ruled out beef patties as a source of the E. coli outbreak linked to Quarter Pounder hamburgers, which has killed at least one person and sickened nearly 75 others. "We remain very confident that any contaminated product related to this outbreak has been removed from our supply chain and is out of all McDonald's restaurants," the fast-food chain's chief supply chain officer Cesar Pina said in a statement. The Colorado Department of Agriculture said that all subsamples from multiple lots of McDonald's brand fresh and frozen beef patties had tested negative for E. coli, adding that it had completed beef testing and does not anticipate receiving further samples. McDonald's said it would resume distribution of fresh supplies of the Quarter Pounder and that it is expected to be available in all restaurants in the coming week, according to the statement.

The US Centers for Disease Control and Prevention said on Wednesday that slivered onions served on McDonald's, opens new tab Quarter Pounder hamburgers and other menu items were the likely source of an E. coli outbreak that sickened 90 people. The outbreak linked to Quarter Pounder was first reported on Oct 22, and slivered onions were suspected to be the source of the infections. The US Food and Drug Administration and the company have confirmed that Taylor Farms was the supplier for the affected locations, and it has since recalled several batches of yellow onions produced in a Colorado facility. The FDA on Wednesday said it had initiated inspections at a Taylor Farms processing center in Colorado, a state where 29 people have fallen ill due to the outbreak. An onion grower of interest in Washington state is also being investigated, the FDA added. The CDC said the number of infected people has risen by 15 people from 75 and 27 persons have been hospitalised due to the illness, which has already killed one person.

High-tech water filters are wonderful. But what if you could go DIY, using just a piece of wood?

The new materials could one day be used for building devices that have the properties of living things, such as the ability to self-heal.

Treat these foods with caution to avoid food poisoning.

An annual health check of Queensland's Mary River records E. coli higher than recommended levels at two popular swimming spots.

Co-op is recalling Co-op Sliced Pepperoni because E. coli O157 has been found in the product.

Sulfur is essential for biological processes such as amino acid biogenesis, iron–sulfur cluster formation, and redox homeostasis. To acquire sulfur-containing compounds from the environment, bacteria have evolved high-affinity uptake systems, predominant among which is the ABC transporter family. Theses membrane-embedded enzymes use the energy of ATP hydrolysis for transmembrane transport of a wide range of biomolecules against concentration gradients. Three distinct bacterial ABC import systems of sulfur-containing compounds have been identified, but the molecular details of their transport mechanism remain poorly characterized. Here we provide results from a biochemical analysis of the purified Escherichia coli YecSC-FliY cysteine/cystine import system. We found that the substrate-binding protein FliY binds l-cystine, l-cysteine, and d-cysteine with micromolar affinities. However, binding of the l- and d-enantiomers induced different conformational changes of FliY, where the l- enantiomer–substrate-binding protein complex interacted more efficiently with the YecSC transporter. YecSC had low basal ATPase activity that was moderately stimulated by apo FliY, more strongly by d-cysteine–bound FliY, and maximally by l-cysteine– or l-cystine–bound FliY. However, at high FliY concentrations, YecSC reached maximal ATPase rates independent of the presence or nature of the substrate. These results suggest that FliY exists in a conformational equilibrium between an open, unliganded form that does not bind to the YecSC transporter and closed, unliganded and closed, liganded forms that bind this transporter with variable affinities but equally stimulate its ATPase activity. These findings differ from previous observations for similar ABC transporters, highlighting the extent of mechanistic diversity in this large protein family.

Boris Macek
Feb 1, 2008; 7:299-307
Research

Sulfur is essential for biological processes such as amino acid biogenesis, iron–sulfur cluster formation, and redox homeostasis. To acquire sulfur-containing compounds from the environment, bacteria have evolved high-affinity uptake systems, predominant among which is the ABC transporter family. Theses membrane-embedded enzymes use the energy of ATP hydrolysis for transmembrane transport of a wide range of biomolecules against concentration gradients. Three distinct bacterial ABC import systems of sulfur-containing compounds have been identified, but the molecular details of their transport mechanism remain poorly characterized. Here we provide results from a biochemical analysis of the purified Escherichia coli YecSC-FliY cysteine/cystine import system. We found that the substrate-binding protein FliY binds l-cystine, l-cysteine, and d-cysteine with micromolar affinities. However, binding of the l- and d-enantiomers induced different conformational changes of FliY, where the l- enantiomer–substrate-binding protein complex interacted more efficiently with the YecSC transporter. YecSC had low basal ATPase activity that was moderately stimulated by apo FliY, more strongly by d-cysteine–bound FliY, and maximally by l-cysteine– or l-cystine–bound FliY. However, at high FliY concentrations, YecSC reached maximal ATPase rates independent of the presence or nature of the substrate. These results suggest that FliY exists in a conformational equilibrium between an open, unliganded form that does not bind to the YecSC transporter and closed, unliganded and closed, liganded forms that bind this transporter with variable affinities but equally stimulate its ATPase activity. These findings differ from previous observations for similar ABC transporters, highlighting the extent of mechanistic diversity in this large protein family.

Sulfur is essential for biological processes such as amino acid biogenesis, iron–sulfur cluster formation, and redox homeostasis. To acquire sulfur-containing compounds from the environment, bacteria have evolved high-affinity uptake systems, predominant among which is the ABC transporter family. Theses membrane-embedded enzymes use the energy of ATP hydrolysis for transmembrane transport of a wide range of biomolecules against concentration gradients. Three distinct bacterial ABC import systems of sulfur-containing compounds have been identified, but the molecular details of their transport mechanism remain poorly characterized. Here we provide results from a biochemical analysis of the purified Escherichia coli YecSC-FliY cysteine/cystine import system. We found that the substrate-binding protein FliY binds l-cystine, l-cysteine, and d-cysteine with micromolar affinities. However, binding of the l- and d-enantiomers induced different conformational changes of FliY, where the l- enantiomer–substrate-binding protein complex interacted more efficiently with the YecSC transporter. YecSC had low basal ATPase activity that was moderately stimulated by apo FliY, more strongly by d-cysteine–bound FliY, and maximally by l-cysteine– or l-cystine–bound FliY. However, at high FliY concentrations, YecSC reached maximal ATPase rates independent of the presence or nature of the substrate. These results suggest that FliY exists in a conformational equilibrium between an open, unliganded form that does not bind to the YecSC transporter and closed, unliganded and closed, liganded forms that bind this transporter with variable affinities but equally stimulate its ATPase activity. These findings differ from previous observations for similar ABC transporters, highlighting the extent of mechanistic diversity in this large protein family.

We report the first clinical Escherichia. coli strain EC3000 with concomitant chromosomal colistin and carbapenem resistance. A novel in-frame deletion, 6-11(RPISLR), in pmrB contributing to colistin resistance was verified using recombinant DNA techniques. Although decreased fitness compared to the wild-type (WT) strain or EC3000 revertant (chromosomal replacement of WT pmrB in EC3000), a portion of serially passaged EC3000 strains preserving colistin resistance without selective pressure raises the concern for further spread.

Barbara J. Stoll
May 1, 2011; 127:817-826
ARTICLES

The Delaware Division of Public Health (DPH) is advising Delawareans of a multistate outbreak of E. coli infections linked to chopped romaine lettuce from the Yuma, Arizona, growing region. The lettuce could be contaminated with Shiga toxin-producing Escherichia coli O157:H7 and could make people sick. To date, there have been no confirmed cases reported in Delaware, but DPH urges consumers to take precautions to prevent illness.

The Delaware Division of Public Health (DPH) has advised the operator of Broadkiln Beach Water Company located in Sussex County to issue a boil water notice to customers after water samples collected from the system tested positive for the presence of E-coli bacteria on Friday, July 20. Because the Broadkiln Beach Water Company shares a connection with PrimeHook Water Company, anyone who uses drinking water from either system should not drink the water without boiling it first.

The Delaware Division of Public Health (DPH) is advising Delawareans of a multistate outbreak of E. coli infections linked to romaine lettuce. The lettuce could be contaminated with Shiga toxin-producing Escherichia coli O157:H7 and could make people sick. To date, there have been no confirmed cases reported in Delaware, but DPH urges consumers to take precautions to prevent illness.

Title: First Death Reported in E. Coli Outbreak Tied to Romaine Lettuce
Category: Health News
Created: 5/2/2018 12:00:00 AM
Last Editorial Review: 5/3/2018 12:00:00 AM

Title: E. Coli Outbreak Tied to Ground Beef Climbs to 177 Cases
Category: Health News
Created: 4/29/2019 12:00:00 AM
Last Editorial Review: 4/30/2019 12:00:00 AM

Escherichia coli DNA Pol I can carry out three enzymatic reactions: It possesses 5' -> 3' DNA polymerase activity and 3' -> 5' and 5' -> 3' exonuclease activity. Pol I can be cleaved by mild treatment with subtilisin into two fragments; the larger fragment is known as the Klenow fragment. The Klenow fragment retains the polymerizing activity and the 3' -> 5' exonuclease of the holo-enzyme but lacks its powerful 5' -> 3' exonuclease activity. These enzymes and their applications in molecular cloning are introduced here.

The Klenow fragment, which retains the template-dependent deoxynucleotide polymerizing activity and the 3' -> 5' exonuclease of the holo-enzyme but lacks its powerful 5' -> 3' exonuclease activity, is used to fill recessed 3' termini of dsDNA. In this protocol, fragments suitable as templates for the end-filling reaction are produced by digestion of DNA with an appropriate restriction enzyme. The Klenow enzyme is then used to catalyze the attachment of dNTPs to the recessed 3'-hydroxyl groups.

The bacteria are winning.

The U.S. Department of Agriculture’s Food Safety and Inspection Service (FSIS) is issuing a public health alert for raw non-intact beef products derived from imported beef from Ontario, Canada that has been recalled by Ryding-Regency Meat Packers, Ltd. because it may be contaminated with E. coli O157:H7.

Pride of Florida, a Raiford, Fla. establishment, is recalling approximately 64,797 pounds of raw beef products that may be contaminated with E. coli O157:H7.

Missa Bay, LLC, a Swedesboro, N.J. establishment, is recalling approximately 75,233 pounds of salad products that contain meat or poultry because the lettuce ingredient may be contaminated with E. coli O157:H7.