A J&J vaccine only offered hints of protection in women in five sub-Saharan Africa countries

Israelis who had an infection were more protected against the Delta coronavirus variant than those who had an already highly effective COVID-19 vaccine

Agencies agree China didn’t know about virus until outbreak, but give different weight to “lab leak” versus natural spillover

Researchers have urged regulators to take new approach to nonstick compounds

As United States reveals its plan to offer an extra dose of COVID-19 vaccine, equity and scientific questions abound

Israelis who had an infection were more protected against the Delta coronavirus variant than those who had an already highly effective COVID-19 vaccine