Histopathologic and Electron Microscopic Studies of Cutaneous Lesions in Calves with Experimentally Induced East Coast Fever (Theileriosis)
Abstract
Skin lesions of bovine East Coast fever were examined
by light and electron microscopy at 120 hours after attachment
of Rhipicephalus appendiculatus ticks infected with
Theileria parva. Lesions included epidermal ulcer, hemorrhage,
edema, necrosis, and inflammatory cell infiltration
by mostly polymorphonuclear and mononuclear (lymphoid)
cells.
he trophozoite stage of T parva was observed in a
pa, ~sitophorous vacuole and feeding on neutrophil granules.
Schizonts, some in budding process, and merozoites
were extracellular and among many mononuclear phagocytes
(lymphoid cells). Some rnerozoites were in mononuclear
phagocytes and a granulocyte.
Some of the cells had already
Citation
Am J Vet Res, Vol 39, NO.7Publisher
University of Nairobi Department of Vetinary Pathology