Related Experiment Videos
Developmental biology of Cystoisospora (Apicomplexa: Sarcocystidae) monozoic tissue cysts
David S Lindsay1, Alice E Houk, Sheila M Mitchell
1Department of Biomedical Science and Pathology, Virginia-Maryland Regional College of Veterinary Medicine, Virginia Tech, 1410 Prices Fork Road, Blacksburg, Virginia 24061.
Abstract:
Tissue cyst stages are an intriguing aspect of the developmental cycle and transmission of species of Sarcocystidae. Tissue-cyst stages of Toxoplasma, Hammondia, Neospora, Besnoitia, and Sarcocystis contain many infectious stages (bradyzoites). The tissue cyst stage of Cystoisospora (syn. Isospora) possesses only 1 infectious stage (zoite), and is therefore referred to as a monozoic tissue cyst (MZTC). No tissue cyst stages are presently known for members of Nephroisospora. The present report examines the developmental biology of MZTC stages of Cystoisospora Frenkel, 1977 . These parasites cause intestinal coccidiosis in cats, dogs, pigs, and humans. The MZTC stages of C. belli are believed to be associated with reoccurrence of clinical disease in humans.