Definition: A pathogen is a biological agent – such as a bacterium, virus, fungus, parasite or prion – that can cause disease in a host organism. In simple terms: a pathogen is an infectious microbe ...

The body defends itself against pathogens by depriving them of vital iron. However, this strategy doesn't always succeed against Salmonella. Researchers have discovered that these bacteria ...

How does your immune system decide between fighting invading pathogens now or preparing to fight them in the future? Turns out, it can change its mind. Every person has 10 million to 100 million ...

This article was originally featured on Undark. It all started when Christopher Mason’s 3-year-old daughter licked a subway pole. Like any parent, he was horrified, but also keenly curious: What types ...