Brazil has recorded more than 4,000 Covid-related deaths in 24 hours for the first time, as a more contagious variant fuels a surge in cases.
People diagnosed with Covid-19 in the previous six months were more likely to develop depression, dementia, psychosis and stroke, researchers have found.
A trial of the Oxford-AstraZeneca Covid vaccine on children has stopped giving out jabs while the UK's medicines regulator investigates a possible link with rare blood clots in adults.
The head of the World Health Organization (WHO) has said further investigation is needed to conclusively rule out that Covid-19 emerged from a laboratory in China.
Pfizer says its vaccine is preventing 91% of coronavirus cases in the six months after people are immunised.
Pfizer says trials of its Covid vaccine in children aged 12 to 15 show 100% efficacy and a strong immune response.
Unusual blood clots in the brain have been detected in a handful of people after they were injected with the Oxford-AstraZeneca vaccine.
A single dose of the Pfizer or AstraZeneca vaccine was effective at stopping 62% of coronavirus infections in care homes, a study has found.
The UK and the European Union have said they are working together to improve their relationship, after weeks of tensions over Covid vaccine supplies.
Scientists believe they have worked out why biting down on ice or drinking something really cold causes excruciating pain for some people.
