Most pandemics start when a pathogen spreads from animals to humans. It's a leading explanation for the COVID-19 pandemic: ...

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 video explains how viruses and bacteria cause certain communicable diseases to occur, how our bodies protect themselves ...

There are approximately 90 tick species in the U.S. alone, and many of them carry pathogens. While Lyme disease remains the ...

Like the dengue and Zika viruses, Oropouche virus causes a febrile illness. There are recent indications that infections during pregnancy can cause damage to unborn babies. Researchers have now ...