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Most US intelligence agencies believe coronavirus was passed from animals to human, and not linked to a Chinese lab.
People are twice as likely to need hospital care if they are sick with the Delta Covid variant, rather than the Alpha variant that was once prevalent in the UK, data from England suggests.
A major review of vaccines suggests the AstraZeneca jab does raise the risk of blood clots and another serious condition that can cause bleeding.
"The window of opportunity" to conduct crucial studies into how the Covid-19 pandemic started is closing, senior scientists have said.
More than half of India's eligible population - some 473 million people - have received at least one dose of a Covid vaccine, official data says.
Some patients with impaired immune systems have a low or absent antibody response after receiving two doses of Covid vaccine, a UK study has found.
The UK has ordered 35 million more doses of the Pfizer-BioNTech vaccine, which will be delivered in the second half of 2022.
An official from the World Health Organization says more emergency supplies are needed urgently.
Israel's government says the measure is aimed at avoiding the hardships and developmental setbacks caused by school closures.
The new permanent International Scientific Advisory Group for Origins of Novel Pathogens would help streamline the process for dealing with dangerous new pathogens.