A shocking new study shows that 90% of freshwater fish in Southern California may be carrying parasites that can infect ...

Protozoa: Protozoa are single-celled organisms that can multiply in humans. These parasites can spread through contaminated food and water, person-to-person contact, and insect bites. Protozoa ...

Screwworm parasites primarily infect livestock, but human cases have risen in Central America after the pests escaped ...

There are parasites all over the world that can infect humans. Some of them are easy to avoid, but others are more common ...

Sea cucumbers spend their lives prowling the ocean floor, scavenging for food and generally minding their own business. We ...

Mosquitoes do a superb job of spreading diseases like malaria – now researchers have shown it's possible to hijack these pests and distribute vaccines via mosquito bite. In human trials, these ...

Ticks are parasites that bite and feed on humans and pets. They can spread Lyme disease and other infections. Here's what to know.