The UK government has signed deals for 90 million doses of promising coronavirus vaccines that are being developed.
England's contact tracers have only reached about 50% of people who have been in close contact with someone with Covid-19 in an area of Lancashire where new cases are rising.
Millions of people around the world could be exposed to dangerous levels of heat stress - a dangerous condition which can cause organs to shut down.
A major new study published in the Lancet medical journal suggests falling fertility rates mean nearly every country could have shrinking populations by the end of the century, and warns of a "jaw-dropping" impact on societies.
The UK could see about 120,000 new coronavirus deaths in a second wave of infections this winter, scientists say.
As Fifi the llama munches on grass on a pasture in Reading, her immune system has provided the template for a coronavirus treatment breakthrough.
Florida has registered a state record of 15,299 new coronavirus cases in 24 hours - around a quarter of all of the United States' daily infections.
Australia's second-largest city has begun a second lockdown in response to a spike in new coronavirus infections.
A BBC investigation has found that two life-saving drugs used to treat Covid-19 patients in India - remdesivir and tocilizumab - are in short supply and being sold for excessive rates on a thriving black market. Vikas Pandey reports from the capital Delhi.
The World Health Organization has acknowledged there is emerging evidence that the coronavirus can be spread by tiny particles suspended in the air.
