Dictionary > Coccidiosis


Coccidiosis refers to the condition in which a host harbors coccidian parasites. Coccidia are intestinal parasites of mammals, birds, reptiles, and amphibians. They infect the epithelial cells lining the intestinal wall. The infection begins by the ingestion of sporulated oocyst of a coccidian parasite. The sporozoites are then released, and in the presence of trypsin or bile of the host, they become active and invade epithelial cells as trophozoites. Upon further development, the trophozoites give rise to merozoites that can reproduce either asexually or sexually. The most typical symptom is diarrhea. Coccidiosis in humans is caused by Cystoisospora belli, Cyclospora and Cryptosporidium species. In dogs and cats, the common species causing coccidiosis is Isospora. In young dogs and cats, coccidiosis can lead to serious symptoms and may even lead to death. Common treatment is by administering coccidiostats that disrupt the reproduction of the coccidian parasite.

See also


  1. Coccidia Life Cycle – WikiVet English. (2012). Retrieved from Wikivet.net website: https://en.wikivet.net/Coccidia-Life-Cycle
  2. Protozoal enteritis: Coccidiosis. (2020). Retrieved February 24, 2020, from Medirabbit.com website: http://www.medirabbit.com/EN/GI_diseases/Protozoal_diseases/Cocc_en.htm
  3. CDC – Cystoisosporiasis – Biology. (2019). Retrieved from https://www.cdc.gov/parasites/cystoisospora/biology.html
  4. Cryptosporidium infection – Symptoms and causes. (2016). Retrieved from Mayo Clinic website: https://www.mayoclinic.org/diseases-conditions/cryptosporidium/symptoms-causes/syc-20351870

© Biology Online. Content provided and moderated by Biology Online Editors

You will also like...

IQ, Creativity and Learning
IQ, Creativity and Learning

Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

Human Reproduction
Human Reproduction

Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..

Hormone Production
Hormone Production

Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..

DNA - schematic
Genetic Mutations

This tutorial looks at the mutation at the gene level and the harm it may bring. Learn about single nucleotide polymorph..

Ecosystem Succession
Ecosystem Succession

If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

3D rendering of an antibody
Passive and Active Types of Immunity

Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..