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A parasite is an organism that lives on or in a host and gets its food from or at the expense of its host. Parasites can cause disease in humans. Some parasitic diseases are easily treated and some are not. The burden of these diseases often rests on communities in the tropics and subtropics, but parasitic infections also affect people in developed countries.

More about parasites »

Parasites A-Z Index:

Parasites Topics


An ancient disease that affects millions of people worldwide...

Neglected Tropical Diseases

Affecting one sixth of the world’s population...

Parasites and Water

Parasites in drinking water as well as recreational water...

Parasites and Insects

They’re called "vectors" when they transmit disease …

Neglected Parasitic Infections in the United States

Five parasitic infections that have been targeted by CDC...

Parasites and Animals/Pets

Parasitic diseases transmitted from animals, maybe your pets...

Parasites and Food

Parasites can be transmitted by food...

Parasites and Blood

Some serious parasitic diseases are bloodborne...

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  • Page last updated: August 27, 2015 The U.S. Government's Official Web PortalDepartment of Health and Human Services
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