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Parasitic Diseases

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About Parasites

A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans:

 Entamoeba histolyica trophozoite
 Entamoeba histolytica, the parasite that causes amebiasis. A microscope is necessary to view this parasite. (CDC Photo)


Protozoa are microscopic, one-celled organisms that can be free-living or parasitic in nature. They are able to multiply in humans which contributes to their survival and also permits serious infections to develop from just a single organism. Transmission of protozoa that live in the human intestine to a human typically occurs by a fecal-oral route (for example, contaminated food or water, or person-to-person contact). Protozoa that live in the blood or tissue of humans are transmitted to humans by an arthropod vector (for example, through the bite of a mosquito or sand fly).

The protozoa that are infectious to humans can be classified into four groups based on their mode of movement:

  1. Sarcodina – the ameba, e.g., Entamoeba
  2. Mastigophora – the flagellates, e.g., Giardia, Leishmania
  3. Ciliophora – the ciliates, e.g., Balantidium
  4. Sporozoa – organisms whose adult stage is not motile e.g., Plasmodium, Cryptosporidium


An Ascaris lumbriocoides worm
An adult Ascaris lumbriocoides worm. Their size can range from 15 to 35 cm. (CDC Photo)

Helminths are large, multicellular organisms that are generally visible to the naked eye in their adult stages. Like protozoa, helminths can be either free-living or parasitic in nature. In their adult form, helminths cannot multiply in humans. There are three main groups of helminths (derived from the Greek word for worms) that are human parasites:

  1. Flatworms (platyhelminths) – these include the trematodes (flukes) and cestodes (tapeworms).
  2. Thorny-headed worms (acanthocephalins) – the adult forms of these worms reside in the gastrointestinal tract. The acanthocephala are thought to be intermediate between the cestodes and nematodes.
  3. Roundworms (nematodes) – the adult forms of these worms can reside in the gastrointestinal tract, blood, lymphatic system or subcutaneous tissues. Alternatively, the immature (larval) states can cause disease through their infection of various body tissues.

Some consider the helminths to also include the segmented worms (annelids)—the only ones important medically are the leeches. Of note, these organisms are not typically considered parasites.

 An adult louse
 An adult louse; actual size is about as big as a sesame seed. (CDC Photo)


Although the term ectoparasites can broadly include blood-sucking arthropods such as mosquitoes (because they are dependent on a blood meal from a human host for their survival), this term is generally used more narrowly to refer to organisms such as ticks, fleas, lice, and mites that attach or burrow into the skin and remain there for relatively long periods of time (e.g., weeks to months). Arthropods are important in causing diseases in their own right, but are even more important as vectors, or transmitters, of many different pathogens that in turn cause tremendous morbidity and mortality from the diseases they cause.

Parasitic Infections

Parasitic infections cause a tremendous burden of disease in both the tropics and subtropics as well as in more temperate climates. Of all parasitic diseases, malaria causes the most deaths globally. Malaria kills approximately 1 million people each year, most of them young children in sub-Saharan Africa.

The neglected tropical diseases (NTDs), which have suffered from a lack of attention by the public health community, include parasitic diseases such as lymphatic filariasis, onchocerciasis, and Guinea worm. The NTDs kill approximately 500,000 people annually, largely in rural areas of low-income countries, but it is the enormous burden of morbidity due to these diseases that extracts the largest toll on endemic populations, with lost ability to attend school or work, retardation of growth in children, impairment of cognitive skills and development in young children, and the serious economic burden placed on entire countries.

However, parasitic infections also affect persons living in developed countries, including the United States.

  • Trichomonas is the most common parasitic infection in the U.S., accounting for an estimated 7.4 million cases per year.
  • Giardia and Cryptosporidium are estimated to cause 2 million and 300,000 infections annually in the U.S., respectively. Cryptosporidiosis is the most frequent cause of recreational water-related disease outbreaks in the U.S., causing multiple outbreaks each year.
  • There are an estimated 1.5 million new Toxoplasma infections and 400–4,000 cases of congenital toxoplasmosis in the U.S. each year; 1.26 million persons in this country have ocular involvement due to toxoplasmosis; and toxoplasmosis is the third leading cause of deaths due to food-borne illnesses (375+ deaths).

Related Parasitic Diseases

For more information on parasitic diseases see our A-Z Index of Parasitic Diseases.


Page last modified: May 1, 2008
Page last reviewed: February 27, 2007
Content Source:
Division of Parasitic Diseases (DPD)
National Center for Zoonotic, Vector-borne, and Enteric Diseases (ZVED)
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