Health News

AstraZeneca, Sputnik Vaccines Face Hurdles With Annual COVID Shots

ZURICH (Reuters) – Vaccines from AstraZeneca, Russia’s Gamaleya Institute and Johnson & Johnson fight the coronavirus with another virus, leaving scientists concerned the shots may lose potency if annual inoculations become necessary to fight new variants. So-called viral vector shots – also used by several Chinese COVID-19 vaccine developers – use harmless modified viruses as […]