PMID: 15241973Jul 10, 2004Paper

An outbreak of Marek's disease in chickens in central Ethiopia

Tropical Animal Health and Production
F Lobago, M Woldemeskel

Abstract

A study was conducted on an outbreak of Marek's disease in a commercial poultry farm containing 8500 chickens in central Ethiopia. On repeated visits, farm and flock history was collected, sick birds were examined and clinical signs and daily mortality were recorded. A total of 80 (27 sick and 53 dead) birds 12-22 weeks old, were collected, autopsied and examined. The mortality rate was 46% for the first 14 weeks of the outbreak. Acute and chronic (classical) forms of the disease, the respective occurrence of which varied significantly (p<0.01) in young (14.6% vs 85.4%) and adults (48.7% vs 51.31%) were manifested. All the autopsied birds had gross and microscopic lesions indicative of Marek's disease in the peripheral nerve(s) and/or visceral organs. Lesions involving peripheral nerves and visceral lymphomas were recorded mainly in adults (28/35, 80%) and young birds (34/45, 75%), respectively. These differences in the two age groups were statistically significant (p<0.01). Young birds seem to be highly susceptible to the acute disease. Poor management, overstocking and lack of vaccination might have favoured the outbreak. Marek's disease causes considerable economic loss and is a major threat to poultry production in Ethiopia...Continue Reading

Citations

Feb 21, 2009·Tropical Animal Health and Production·Mersha ChanieSamuel Bekele Tilahun
Sep 6, 2013·Annual Review of Genomics and Human Genetics·Cadhla Firth, W Ian Lipkin
Dec 4, 2014·Preventive Veterinary Medicine·Emmanuel SamboRobert M Christley
Dec 16, 2016·Tropical Animal Health and Production·Berhan DemekeEsayas Gelaye
Mar 12, 2013·The Veterinary Record·H K MuniyellappaN K Shivakumar Gowda

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