Parasitic worms infesting the brains of moose are likely playing a role in the animal's decline in some parts of North America.

If the needs of both parasites and hosts are met by the niche, they can move in. Increasing biodiversity may therefore be a double-edged sword.

A new analysis of head lice genetic diversity suggests that the parasites came to the Americas twice.

Like Lyme disease, babesiosis is a common tick-borne illness, one that's on the rise in the United States. Here's what you should know.

Mushrooms of the genus Mycena not only live off of dead trees and plants, but also young, healthy trees and plants.

A brain-altering parasite called the liver fluke turns ants into zombies at dawn and dusk, report researchers.

Newly-detected strains of malaria-causing parasites in Ethiopia are resistant to current treatments and are able to evade detection.

Being infected with multiple strains of the parasite that induces Chagas disease may actually hinder its progression, a new study shows.

When parasitic trematodes infect amphipods, the tiny crustaceans turn bright orange and lose their tendency to run for cover when exposed.