Chrysomya bezziana: Pathology of Old World screw-worm fly infestations in cattle |
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| Authors: | JD Humphrey JP Spradbery RS Tozer |
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| Institution: | Department of Primary Industry, Central Veterinary Laboratory, P.O. Box 6372 Boroko, Papua New Guinea;CSIRO Division of Entomology, Screw-Worm Fly Project, P.O. Box 6712 Boroko, Papua New Guinea;Department of Primary Industry, Central Veterinary Laboratory, P.O. Box 6372, Boroko, Papua New Guinea |
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| Abstract: | Two experiments were undertaken to describe the clinical and pathological effects in cattle of larval infestation of the Old World screw-worm fly, Chrysomya bezziana. Clinically, intermittent irritation and pyrexia were present. A cavernous lesion was formed, characterized by progressive liquifactive necrosis and hemorrhage, followed by gross fibrous involution subsequent to larval exodus. Histologically, two distinct phases were evident: a phase of necrosis, intense neutrophil infiltration, and hemorrhage associated with tissue invasion and growth of larvae; and a fibroplastic, healing phase in which mast cells and eosinophils were prominent. Significant hematological and biochemical changes included an initial neutrophilia, anemia, and decreased total serum protein with a progressive rise in serum globulins. A significant loss in body weight occurred in infested animals. |
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| Keywords: | Arthropod parasitic Old world screw-worm fly Cattle Myiasis Pathology Immunology Clinical syndrome |
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