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.

Dr Semyon Grigoryev, 46, had been leading the research into the remains of the Ice Age beasts, frozen for tens of thousands of years in the Siberian permafrost.

Andre's cause of death currently remains unknown but sources confirmed to Variety on Friday that he had passed away.

Experts have slammed a 'misconception' that one single scientist was the 'architect of the lockdown' and single-handedly convinced the government to introduce drastic social distancing measures.

Hundreds of Belarusians, including Second World War veterans, attended a Victory Day parade in Minsk on Saturday that marked the 75th anniversary of the allied victory over Nazi Germany.

Rock music legend Little Richard has died at the age of 87, his family have confirmed. The star, whose hits included Tutti Frutti, Long Tall Sally, and Good Golly Miss Molly, inspired a generation of musicians.

'Buddy system' is to be introduced tomorrow on Belgium's Mothering Sunday. Similar ideas are being contemplated in the UK.

The 32-year-old Olympic bronze medalist is joining fellow pro-wrestler Sonya Deville on the cast of E!'s Total Divas in Season 9, which premieres Wednesday, October 2.

Two weeks ago, the New England Patriots were preparing for an inevitable Super Bowl victory. Just 14 days later and now one of their best players could be headed for the WWE.

Rory McIlroy made a healthy start to the US Open on Thursday night as he shot up the leaderboard with a three-under par round of 68. 

MARTIN SAMUEL - CHIEF SPORTS WRITER AT PEBBLE BEACH: After years of woe in the US Open first round, Rory McIlroy delivered arguably his strongest opening day since 2014.

BETTING GUIDE: The 2019 Open Championship. Rory McIlroy and Brooks Koepka are heavily fancied. But who else is worth a punt? CHRIS CUTMORE makes his picks here.

MARTIN SAMUEL - CHIEF SPORTS WRITER AT ROYAL PORTRUSH: To be on the coastline of County Antrim this week is to see a country beaming its most toothsome smile.

An emotional Rory McIlroy was left holding back tears after missing the cut in The Open at Royal Portrush by a shot following a valiant six-under par second round of 65. 

Koepka sought out DeChambeau on the putting green before the start of the final round on Sunday, while Englishman Eddie Pepperell characteristically took no prisoners.

DEREK LAWRENSON - WORLD OF GOLF: Are we about to see a genuine rivalry break out in golf? Goodness knows, there have been enough false dawns.

He's less than two months away from celebrating seven years of marriage to Jessica Biel, with whom he raises four-year-old son Silas.

DEREK LAWRENSON - WORLD OF GOLF: JP Fitzgerald took two years off after being fired as Rory McIlroy's caddie in the summer of 2017.

Brooks Koepka has poked a little bit of fun at Rory McIlroy after being asked whether there is a rivalry between the two players. He doesn't consider McIlroy a rival after his poor form in majors.

BY RIATH-AL-SAMARRAI: Brooks Koepka said in October that theirs wasn't much of a rivalry and he was right. Then. But now? In four tournaments since, McIlroy has gone 3-1-4-3.

The 23-year-old reality star flaunted her impressively long legs in a golden feathered mini dress before enlisting the help of a pair of horses to give her the ultimate photo shoot backdrop.

His appearance is his first public outing in 17 months, with his first Halloween trip being to Drake's bash earlier in the evening,

Demi Rose, 24, continued the sizzling display on her Instagram as she slipped into a tiny yellow bikini which put focus on her ample assets.

The actress, 54, confirmed on Thursday that her co-stars Bette Midler and Kathy Najimy are set to return for the follow-up project.

Miley Cyrus and Cody Simpson packed on the PDA and the comedy when they spent the day with the pop superstar's family in Los Angeles on Friday.

The music mogul, 60, was greeted with a jovial cake featuring a bare hairy chest with a six-pack, unbuttoned white shirt and high-waisted black trousers in a nod at his signature look.

The Mummy Diaries star, 28, posted four pictures of her house beautifully decorated with a ceiling full of orange balloons and personalised pumpkin name places.

Halloween may be over, but Kim Kardashian West is still sharing her family's costumes.On Sunday, the 39-year-old reality star took to her Instagram to share yet another set of Halloween costumes.

Kim Kardashian shared a sweet candid shot of her daughter North West, six, goofing around with her friend Ryan Romulus on Monday.

Casper the lurcher, left, was dumped at the Rescue Me Animal Sanctuary in Merseyside, right. According to vets who treated him, the dog was extremely malnourished.

Two Siberian Huskies, Sky and Kakoa, from Arizona, were in for quite a shock as their owner dressed as a wolf to play a prank on them. Video of the hilarious encounter went viral on social media.

Starbucks, Costa, Pret, Starbucks and Greggs have unveiled Christmas menus, but while prices appear more expensive, it's cheaper than buying a regular coffee and adding flavours and creams.

With Halloween over, the gift giving Holiday season is upon us. And Emma Roberts was joined by Lea Michele to kick off a new campaign by department store Kohl's, in NYC.

Mary Coker, a Broward County Public Schools official who got laughs dressed as a flasher at a Halloween party in what appears to be a school office with kids present, is now facing consequences.

The latest criticism followed a death threat which the BBC presenter received two weeks ago after he and dance partner Katya Jones, 30, scraped through the Halloween special dance off.

The British bargain shop is normally the go to for cheap Halloween costumes and toiletries but now they're proving that their homeware range lives up to more expensive brands.

She was her husband Justin Timberlake from his 'N SYNC days for Halloween this year. And weeks after rocking the ingenious costume, Jessica Biel stepped out  for lunch and shopping.

Maya Jama's sexy Halloween snap drove American NBA player Ben Simmons, 23, wild as he couldn't resist leaving two fire emojis in the comments section below.

Bored Panda has rounded up a selection of amusing images of optical illusions from around the world that have sparked terror, including a rug which on first glance appears to be a tiger.

The Duke of York was pictured enjoying the company of Victoria Secret model alongside Epstein's alleged co-conspirator Ghislaine Maxwell at an upscale New York nightclub in October 2000.

The 21-year-old daughter of Lionel Richie shared a pretty pinup photo on Sunday where she had on a string bikini while on the beach. She was last seen with Scott on Halloween.

The pictures show some of the spots in Salem, Massachusetts, where the Disney movie was filmed, matched with scene stills from the flick, which tells the story of three witches resurrected on Halloween.

Ben Simmons set tongues wagging when he left a flirty emoji on one of Maya Jama's Instagram posts last month.

Jack and Harriet Morrison took their last breaths next to one another at a nursing home in Arnold, Missouri. Jack, 86, died first and Harriet, 83, died several hours later.

She recently revealed in her upcoming memoir Open Book that she was sexually abused as a child, which was one of the factors that led to an addiction to alcohol and pills.

The actress, 38, looked back at her time on Inside No. 9, as she shared a sultry snap from behind-the-scenes with fans on Instagram on Monday.

SIR CLIVE WOODWARD: I cannot wait to see Sam Burgess play for Bath, I’m sure he has everything to succeed in union and all England rugby fans should be grateful to Bath for bringing him into the sport.

CHRIS FOY: Never mind the World Cup connotations. For now, the bigger picture can remain out of focus, in the background. Friday night it is all about Wales versus England.

SIR CLIVE WOODWARD: As an England ‘fan’, I’m still buzzing about that win over Wales, while the coach in me is trying not to get too carried away. However, that the result was huge leap forward.

SARAH VINE: We may not be fully conscious of it yet, but lockdown is, in many respects, one giant, unprecedented social experiment. No one has any real idea how it will influence the economy...