Mycoplasma-associated polyarthritis in farmed crocodiles (Crocodylus niloticus) in Zimbabwe

Show simple item record Mohan, K. Foggin, Chris M. Muvavarirwa, P. Honywill, J. Pawandiwa, A.
dc.contributor.editor Verwoerd, Daniel Wynand 2013-09-03T10:46:56Z 2013-09-03T10:46:56Z 2013 1995
dc.description The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. en
dc.description.abstract Outbreaks of polyarthritis in farmed crocodiles (Crocodylus niloticus) on five farms in Zimbabwe are described. Cases were reported only among the rearing stock aged 1-3 years. No breeding stock suffered. Morbidity was about 10% and the mortality even lower. All the sick animals consistently displayed swollen limb joints as well as progressive lameness and paresis. The synovial structures in subacute cases contained mycoplasmas and excess turbid mucus which, at a later stage of the disease, became yellowish, inspissated and sterile. Cellular changes in the joint capsule included oedema, necrosis of the superficial layers of membrane, lymphocytic infiltration and fibrosis. Evidence of pneumonia was observed only at necropsies. Fifteen isolates of Mycoplasma were cultured from the clinical specimens collected from the four sick and three dead crocodiles. The affected joints of all these animals yielded Mycoplasma in pure culture, but the culture from lungs yielded post-mortem invaders also. The sick animals were treated with a single intramuscular injection of long-acting tetracycline(10 mg/kg), and oxytetracycline mixed in feed at 550 mg/kg was fed for 10 d. The treatment appeared to be effective in ameliorating the clinical signs, but in some cases inflammatory swelling persisted. All 15 the isolates conformed to the characteristics of the genus Mycoplasma, and were serologically indistinguishable in growth-inhibition (GI) tests. Although these isolates shared the main biochemical characteristics of Mycoplasma capricolum, they differed serologically. Also goats were refractory to experimental infection with crocodile strains. In crocodile yearlings, however, the disease was reproduced with an isolate from one of the affected farms. The source of infection remained elusive. The farmers suspected poultry meat fed to the crocodiles to be the source. However, GI tests failed to identify the isolates as one of the pathogenic glucose-metabolizing avian mycoplasmas. This appears to be a first report of isolation of Mycoplasma from crocodiles and also of its association in disease. en
dc.description.librarian mn2013
dc.identifier.citation Mohan, K, Foggin, CM, Muvavarirwa, P, Honywill, J & Pawandiwa, A 1995, 'Mycoplasma-associated polyarthritis in farmed crocodiles (Crocodylus niloticus) in Zimbabwe’. Onderstepoort Journal of Veterinary Research, vol. 62, no. 1, pp. 45-49. en
dc.identifier.issn 0330-2465
dc.language.iso en en
dc.publisher Published by the Agricultural Research Council, Onderstepoort Veterinary Institute en
dc.rights © ARC-Onderstepoort (original). © University of Pretoria. Dept of Library Services (digital). en
dc.subject Veterinary medicine en
dc.subject Mycoplasma en
dc.subject Polyarthritis en
dc.subject Crocodiles en
dc.subject Zimbabwe en
dc.subject.lcsh Veterinary medicine -- South Africa
dc.title Mycoplasma-associated polyarthritis in farmed crocodiles (Crocodylus niloticus) in Zimbabwe en
dc.type Article en

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