In the early days of the pandemic, it was extremely rare to hear of people catching Covid twice.
We have the technology to start a new era in medicine by precisely matching drugs to people's genetic code, a major report says.
China has announced its biggest city-wide lockdown since the Covid outbreak began more than two years ago.
The more time girls aged between 11 and 13 spend on social media, the less likely they are to be satisfied with life a year later, a study suggests.
A vaccine has been used to free a man who was trapped at home by a Covid infection that lasted for more than seven months.
The UK's Covid lockdown appears to have had a massive impact on stomach bugs, slashing outbreaks by more than half in England during the first six months of the pandemic.
China and Hong Kong are seeing their largest spike in Covid cases in more than two years, despite determinedly pursuing one of the world's strictest virus elimination policies.
Covid cases have continued to rise in the UK, with an estimated one in every 20 people infected, figures from the Office for National Statistic suggest.
Dozens of social-media influencers are promoting banned tanning products to millions of followers, a BBC News investigation has found.
Multinational companies have halted some operations as China widens its Covid lockdowns - among its biggest since the start of the pandemic.
