So-called challenge trials are common in vaccine development, but only for viruses which have treatments. It comes as scientists around the world race to find a Covid cure - including two in the UK.

Shoppers at Westfield Burwood in Sydney packed into the centre, ignoring social-distancing rules as they did non-essential shoppig.

Christine Ohuruogu has been named Sportswoman of the Year and Becky James has won Young Sportswoman of the Year.

Christine Ohuruogu is preparing to return to the scene of her greatest triumph - not that she has ever watched back the Olympic success of 2008.

Rob Kardashian and Blac Chyna are reportedly being sued for over $2million (£1.6million) following their alleged cyberbullying of her ex Pilot Jones

Blac Chyna, 31, looked in the mood to party as she arrived at the swanky Delilah night club in West Hollywood, California, on Saturday.

Rob Kardashian is trying to get his business off the ground with this help of his mom.

The exes posed for a group photo at local Houston restaurant The Turkey Leg, with Chyna snuggled up to Jay, who had his arm around her while he adoringly looked at her.

The 30-year-old beamed at the event, stemming from the MTV Video Music Awards at the Prudential Center in Newark, New Jersey on Monday.

Blac Chyna took to Instagram with a sweet snap of herself and daughter Dream dressed like Princess Jasmine from the toddler's third birthday party on Sunday.

Blac Chyna and her son King Cairo filmed a workout video together on Saturday in which they lifted and did pushups with kettle bells.

Blac Chyna has revealed she was 'distraught' to learn her daughter Dream Kardashian flew on a helicopter which later crashed, killing basketball star Kobe Bryant and eight others.

The 31-year-old's rep said that Chyna had every right to be there as someone who's in the entertainment industry with her presence on reality TV.

'Unlike 'Bachelor Mom Barb' who expressed her contempt for her potential future daughter-in-law out in the open, Kris and her daughters successfully hid their contempt for Chyna, her lawyer said

JOHNNY NELSON: Anthony Joshua will attempt to wrest his four world heavyweight titles back from the grasp of Andy Ruiz jnr in Saudi Arabia on Sunday night.

JOHNNY NELSON: Never mind the excuses being thrown out by Andy Ruiz. Anthony Joshua deserves great credit for executing the perfect game plan on Saturday night.

JOHNNY NELSON: Tyson Fury delivered a stunning performance to overcome Deontay Wilder in their WBC heavyweight title fight. Fury

She had the nation's attention when she competed on Big Brother in 2014.

She found fame on the 2014 season of Australian Big Brother.

She's known for her picture perfect Instagram snaps.

Her Instagram account is regularly updated with some rather bizarre videos.

She's the former Big Brother star who infamously underwent a botched boob job in Bangkok.

The Big Brother star, 24, put on a busty display in her silk two-piece which she showcased in a series of Instagram posts on Thursday.

She is the former Big Brother contestant who is known for her raunchy social media posts.

Debuting a bright pink hairdo, the 26-year-old reality star filmed herself crying after seeing her 'spirit animal' - an eagle - 'waiting' for her at the top of a hill after her hike.

Blair McDonough has recently made a return to the spotlight, reprising his role as Stuart Parker on Neighbours.

Former reality television star-turned fashion designer Aisha Jade flaunts a physique that's the envy of many. Here, she reveals her daily meal routine and her workout schedule.

If you've ever wondered what happened to Big Brother 2014 contestant Jason Roses, he's popped up at a lunch date with fellow reality show alum Skye Wheatley. 

Former Big Brother winner Tim Dormer recently admitted he and his fiancé Ash Toweel like to use Tinder to meet other men.

Former Australian Big Brother star Jade Albany Pietrantonio has revealed why she had to remove her distinctive mole from her face.

Héctor Aníbal Giménez, a pastor in Argentina, is being investigated for selling a alcohol hand gel which he claimed cures the coronavirus.

Rodney Madex, 69, shot his daughter Tammy, then 44, at his Glengarry North home in Victoria in January 2019.

Chapel Bar and Bistro, in Auckland, took to social media on Tuesday night to make the false announcement they would be open on Wednesday and selling cheap alcohol.

Otsego County Sheriff Richard Devlin, said Josie Wright, 33, was taken into custody for stealing masks (file image) and other medical supplies from Bassett Medical Center in Cooperstown, NY.

Nadia Zevallos claims supervisor Lilly Almeida got away with her behavior because she was having a 'flirtatious and possibly romantic relationship' with dentist David Paltac.'

Married At First Sight's Jo McPharlin has denied undergoing weight loss surgery after being body-shamed and labelled 'too skinny' by Internet trolls.

Retired Colorado Rockies first baseman Todd Helton has been sentenced to two days in jail after pleading guilty last month to a DUI charge from 2019. He has reportedly gone through a treatment program.

Flume has revealed that he was heading down the same path as DJ Avicii who died tragically, aged just 28, in 2018. 

The footballer-turned-actor, 55, shared a throwback image with his wife Tanya, who passed away from cancer aged 53 last year, while penning an impassioned message

The former X Factor star, 28, shared incredible before and after pictures of herself on Instagram as she reflected on her weight loss journey on Friday.

Married At First Sight's Jo McPharlin showcased her staggering weight loss as she promoted Jules Robinson's new shapewear brand Figur on Saturday. 

Ferguson, 46, died in an Adelaide hospital on April 8 from serious health problems including liver and kidney failure, both stemming from years of much publicised alcohol abuse.

Among those to write a lengthy tribute to Ferguson, who died on April 8, was model Kristy Hinze - for whom Ferguson was bridesmaid at her 2009 wedding to U.S billionaire James Clark.

Sydney bar, The Big Easy, have teamed up with Fireball Whisky to create a delicious boozy bucket of chicken and from Friday, April 17th, the meal can be ordered on Menulog.

She's a new face to the Real Housewives of New York and is already making quite the splash.

Jo Ferguson's mother has paid tribute to the fashionista and revealed what happened on a secret trip to Sydney while she was dying. 

Jo Ferguson died in hospital on April 8 from serious health problems including liver and kidney failure, both stemming from years of much publicised alcohol abuse.

A powerful moment on last week's episode of Gogglebox Australia proved the old saying that you can never judge a book its cover.

Australian doctor Juliana Chen has warned making unhealthy lifestyle choices during the coronavirus pandemic can have a negative impact on your health in the long run.

Authorities in New Jersey busting residents for violating lockdown orders charged a pool hall owner who opened for business and 11 people caught drinking alcohol along the bank of a creek.