Vaccination

Pfizer says 3 COVID shots protect children under 5

Three doses of Pfizer's COVID-19 vaccine offer strong protection for children younger than 5, the company announced Monday, another step toward shots for the littlest kids possibly beginning in early summer.

Vaccination

China's bet on homegrown mRNA vaccines holds back nation

China is trying to navigate its biggest coronavirus outbreak without a tool it could have adopted many months ago, the kind of vaccines that have proven to offer the best protection against the worst outcomes from COVID-19.