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 ...

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 ...

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 ...

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