Cytopathological changes induced by Haemogregarina myoxocephali in its fish host and leech vector.

The cytopathological effects of infection with Haemogregarina myoxocephali were investigated by light and electron microscopy in its fish host, Myoxocephalus octodecemspinosus, and in its leech vector, Malmiana scorpii. Gamont-infected erythrocytes in fish appeared vacuolated and exhibited shrinkage and altered shape consistent with loss of cytoskeletal integrity. Infected intestinal epithelial cells in leeches showed changes suggestive of recruitment of host metabolic functions by the developing parasite, including hypertrophied mitochondria and accumulations of endoplasmic reticulum and secretory vesicles next to the parasitophorous vacuole.