An estimated 160 million Covid-19 vaccinations have been administered so far globally, but most of that has been in the US and Europe.
A single shot of either the Oxford-AstraZeneca or the Pfizer-BioNTech Covid jab reduces the chance of needing hospital treatment by more than 80%, an analysis in England shows.
The Brazil coronavirus variant now found in the UK appears more contagious and may evade immunity provided by past infection, scientists say.
US regulators have formally approved the single-shot Johnson & Johnson (J&J) coronavirus vaccine, the third jab to be authorised in the country.
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Ghana has become the first country to receive coronavirus vaccines through the Covax vaccine-sharing initiative.
The first data on the UK Covid vaccine rollout suggests it is having a "spectacular" impact on stopping serious illness, researchers say.
Healthy, young volunteers will be infected with coronavirus to test vaccines and treatments in the world's first Covid-19 "human challenge" study, which will take place in the UK.
Scientists have identified another new variant of coronavirus in the UK with some potentially troubling mutations.
Claims on social media that the Covid vaccine could affect female fertility are unfounded, experts have said.
The World Health Organization recommends using the vaccine developed by the University of Oxford and AstraZeneca even in countries tackling new variants of coronavirus.
