Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

The endogenous forms of Isospora felis were observed within the epithelial cells of the small intestine of the cat. They were situated within a parasitophorous vacuole which was limited by a multimembranous wall. The ultrastructural features of microgametogenesis were studied at 8 days post-infection. The initial phase of microgamont development consisted of cytoplasmic growth accompanied by a number of nuclear divisions. The gamont was enclosed by a pellicle and its surface area was greatly increased by deep invaginations. In the later stages of development the numerous nuclei were situated close to the pellicle. Each nucleus has peripherally condensed chromatin. Formation of the microgametes occurred as protrusions from the microgamont surface. Two basal bodies, the dense portion of a nucleus and a mitochondrion entered each protrusion. The microgametes matured while still attached to the gamont from which they finally budded off into the parasitophorous vacuole leaving a large residual cytoplasmic mass. The mature microgamete was found to consist of an elogate nucleus which overlaps with a mitochondrion towards the anterior end of the organism. The anterior portion contains a dense perforatorium and two basal bodies with attached flagella. In addition a number of microtubules (5-9) were found to run longitudinally from the basal body region.


Journal article


Acta Pathol Microbiol Scand B

Publication Date





151 - 159


Animals, Cats, Host-Parasite Interactions, Intestine, Small, Isospora, Organoids