For years scientists have puzzled over why the intracellular pathogen Salmonella is able to survive — and thrive — in human and animal tissues, even within otherwise hostile cells that are part of the ...

According to estimates, about a third of the world's population is infected with the single-celled parasite Toxoplasma gondii, the pathogen of toxoplasmosis. Although harmless for most people, the ...

Exposure to a virus isn’t an all-or-nothing proposition. The concept of “infectious dose” suggests ways to keep ourselves safer from harm. For a pathogen to make us sick, it must overcome a lot. First ...

Lyme disease is the leading vector-borne disease — meaning diseases that are transmitted to humans from another organism like a tick or mosquito — in North America and Europe. The initial symptoms of ...

For years scientists have puzzled over why the intracellular pathogen Salmonella is able to survive—and thrive—in human and animal tissues, even within otherwise hostile cells that are part of the ...