Parasites live in other host organisms and depend on them for survival. Parasites that can affect humans include ticks, lice, and hookworms. Symptoms of a parasite infection in humans can vary widely.

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

The history of life stretches back untold eons. Today, there is a staggering array of organisms on Earth, with more species being discovered every year. The complexity of life, from the smallest ...

A pathogen is a living thing that causes disease. Viruses and bacteria can be pathogens, but there are also other types of pathogens. Every single living thing, even bacteria themselves, can get ...

An ova and parasites exam is a relatively routine examination that people with severe diarrhea might undergo if they are admitted to a hospital. As the name suggests, the test checks for the presence ...