Mutations in coronavirus have triggered culls of millions of farmed mink in Denmark.
Part of the country has been put under lockdown after Danish authorities found genetic changes they say might undermine the effectiveness of future Covid-19 vaccines.
More than 200 people have been infected with mink-related coronavirus.
And the UK has imposed an immediate ban on all visitors from Denmark amid concerns about the new strain.
The U.S. reported 103,087 new daily coronavirus infections on Wednesday, setting a single-day record for cases, according to data from the COVID Tracking Project.
It has been one of the most baffling aspects of the Covid-19 pandemic. Healthy young men and women have become infected with the virus and developed life-threatening side effects. But at the same time, many of their contemporaries have simply shrugged off the condition.
Unknown factors are clearly leaving some people vulnerable to the pandemic’s worst effects even though some of them are young, are not overweight and do not suffer from other obvious health problems. Scientists think that tiny genetic differences are causing some to be struck down while many others are spared.
Slovakia has begun an ambitious project to test everyone over the age of 10 for Covid-19, but the president has said she thinks the idea is "unfeasible".
The operation to test four million people is to last over two weekends.
Infections have soared in Slovakia and officials argue the only alternative would be a total lockdown.
President Zuzana Caputova called for a rethink of the plan after armed forces chiefs said there were not enough trained health workers to carry it out.
Australia has recorded its first day of no local cases of Covid-19 in almost five months.
Zero cases were reported in the 24 hours between 20:00 on Friday and 20:00 on Saturday - the first time this has happened since 9 June.
(CNN)As much of the world struggles to contain new waves of the Covid-19 pandemic, Taiwan just marked its 200th consecutive day without a locally transmitted case of the disease.
Europe is now battling a second surge of COVID-19 cases, and many worry it could be worse than the first.
The White House science office listed "ending the COVID-19 pandemic" as the top accomplishment of President Trump's first term, even as the U.S. has set records for new daily infections and numerous hospitals across the country are stretched to their breaking points.
Russian President Vladimir Putin's administration is taking its most drastic measures yet to curb the second wave of COVID-19. The Russian government on Tuesday implemented a nationwide mask mandate, as coronavirus cases spike worldwide.
LONDON (Reuters) - Antibodies against the novel coronavirus declined rapidly in the British population during the summer, a study found on Tuesday, suggesting protection after infection may not be long lasting and raising the prospect of waning immunity in the community.
Scientists at Imperial College London have tracked antibody levels in the British population following the first wave of COVID-19 infections in March and April.
