Infections caused by protozoa (single-celled organisms) that affect animals. Protozoa can cause a wide range of diseases in animals, including coccidiosis, giardiasis, leishmaniasis, and toxoplasmosis. These infections can be transmitted through the feces of infected animals, contaminated food or water, or through the bite of an infected insect.

Some common protozoan infections found in animals include:

1. Coccidiosis: a parasitic infection caused by coccidia, which can affect the intestines and other organs of animals such as dogs, cats, and livestock.
2. Giardiasis: an intestinal infection caused by Giardia, which can affect both domestic animals and wildlife.
3. Leishmaniasis: a parasitic disease caused by Leishmania, which can affect animals such as dogs and cats as well as humans.
4. Toxoplasmosis: an infection caused by Toxoplasma gondii, which can affect a wide range of animals, including cats, dogs, livestock, and wildlife.

Protozoan infections in animals can cause a variety of symptoms, such as diarrhea, vomiting, weight loss, and lethargy, and can be diagnosed through laboratory tests such as fecal examinations or blood tests. Treatment may involve antiparasitic drugs, supportive care, and management of secondary infections. Prevention measures include vaccination, sanitation, and control of insect vectors.