External parasites, such as fleas and ticks, live on the body of the host and produce an infestation.

These days, there’s an overwhelming number of products to prevent parasites in pets. How do I know which one to choose?

New evidence suggests that a disease-causing tapeworm that has been spreading across the United States and Canada has arrived ...

The case challenges long-held beliefs about how these parasites behave in humans. A rare medical case from Greece has left ...

A new University of Washington study detected a parasitic tapeworm that can infect domestic dogs and humans in the intestines of one-third of coyotes ...

Paving way for new therapies, researchers decode how parasites that spread one of the world's deadliest diseases use trickery ...

A hidden parasite is spreading across North America that lives inside coyotes and can also reach pets and humans.

A study finds that 41% of traded mammal species share at least one pathogen with humans, compared with just 6.4% of species ...

The notorious disease known as sleeping sickness can lurk inside a host for months or even years before serious symptoms ...

A woman in Greece experienced an extremely rare and unsettling medical condition after unknowingly becoming a host to ...

A Japanese pen with live parasitic worms inside it is going viral on social media, leaving the internet with all sorts of ...