Stanford University researchers determined the code from spare drops in discarded vials of the COVID-19 vaccine and published it on GitHub.

The vaccine was 79 percent effective at blocking symptomatic infections, according to data from a Phase 3 trial in the US, Chile, and Peru. A US safety oversight board says the data might be incomplete.

Two preliminary reports from the UK provide real-world evidence in support of the Pfizer/BioNTech and Oxford-AstraZeneca vaccines.

A preprint casts doubt on vaccine effectiveness in light of certain mutations in the 501Y.V2 variant that emerged from South Africa.

So far, there are three patients known to have been infected with SARS-CoV-2 twice, and in at least one case the second time around was asymptomatic.

The study, conducted in Malawi, Kenya, and Ghana, did not obtain informed consent from each parent whose child participated, but rather considered consent “implied” because of the particular experimental design.

The public health emergency has spurred a mass vaccination campaign.

Just half of respondents in Eastern Europe agree that vaccines are safe.

The World Health Organization and its partners will test the public health effect of immunization in parts of Malawi, Ghana, and Kenya.