FDA OKs mixing COVID-19 vaccines, approves Moderna, J&J boosters

U.S. regulators are extending COVID-19 boosters to Americans who got the Moderna or Johnson & Johnson vaccine. They also said Wednesday anyone eligible for an extra dose can get a brand different from the one they received initially.

Pfizer to vaccinate entire city in Brazil for COVID-19 study

Pfizer researchers want to study the impact of the COVID-19 vaccine in preventing symptomatic cases, reinfections, hospitalizations, deaths, and long-term COVID-19 — so they’re vaccinating the population of an entire city.