Unstained and stained Toxoplasma gondii cysts

Cysts of Toxoplasma gondii usually range in size from 5 to 50 micrometers in diameter. They may be found in various sites throughout the body of the host but are most common in the brain and skeletal and cardiac muscles. Cysts are usually spherical in the brain but more elongated in cardiac and skeletal muscles.
(A) Unstained cyst of T. gondii.
(B) T. gondii cyst in brain tissue stained with hematoxylin and eosin.