Placebo testing has been part of the process since the 1940s. It’s unclear what additional measures would achieve — but it may slow development.

The statement confused experts who said that vaccines aimed at new pathogens have always been tested this way. "That has been ...

Data across nine pre-COVID flu seasons in Ontario reveal that flu vaccine effectiveness (VE) wanes 9% every 28 days beginning 41 days post-vaccination in adults but not in children, according to a ...