If a piece of toast fell on the floor, would you pick it up and eat it? You probably would if you believe in the 5-second rule, which suggests that your spilled breakfast stays germ-free as long as you snatch it up in five seconds.
But while the 5-second rule remains a popular rule of thumb, [...]

Cranberry juice helps prevent bacterial infections. Could it do the same for viral infections? New research says yes. Grab a glass — bottoms up! — and turn the page.

Common influenza infects people around the world. What are the dangers of pandemic bird flu, and what can we do to avoid them? What are the roles of vaccines, international cooperation, and national governments?