Why Evolution Hasn't Gotten Rid of Allergies - YouTube
How does the Delta variant dodge the immune system? Scientists find clues.
One dose of vaccine is not enough to protect against the Delta and Beta variants, new research suggests, and even people who have had Covid-19 should be immunized.
Researchers Are Hatching a Low-Cost Coronavirus Vaccine
A new formulation entering clinical trials in Brazil, Mexico, Thailand and Vietnam could change how the world fights the pandemic.