Seeing sick-looking faces in virtual reality triggers brain circuit changes related to threat detection and boosts activity of certain immune cells.

When people viewed virtual avatars with coughs or rashes, their brains triggered an immune response. The brain activates ...

Terrain theory is making a comeback, offering the illusion that illness is always preventable, and blaming the sick for being ...

People infected with norovirus typically shed “literally billions of viral particles,” said Schaffner, the food safety expert. And it only takes a few viral particles to make someone sick.