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Within-herd spread of contagious bovine pleuropneumonia in Ethiopian highlands

Lesnoff M., Laval G., Bonnet P., Abdicho S., Workalemahu A., Kifle D., Peyraud A., Lancelot R., Thiaucourt F.. 2004. Preventive Veterinary Medicine, 64 : p. 27-40.

DOI: 10.1016/j.prevetmed.2004.03.005

Contagious bovine pleuropneumonia (CBPP) is a major threat for cattle health and production in Africa. This disease is caused by the small-colony type of Mycoplasma mycoides subspecies mycoides (MmmSC). Transmission occurs from direct and repeated contacts between sick and healthy animals. Veterinary services recently reported a resurgence of CBPP in the province of West Wellega, in the Ethiopian highlands. A research program was set up to estimate the epidemiological parameters of the within-herd infection spread. A follow-up survey was implemented in 71 sampled herds of the Boji district (West Wellega province). Fifteen herds were classified as newly infected and used in a serological- and clinical-incidence study. The overall 16-month cumulative sero-incidence risk was 34%. Clinical cases were recorded for 39% of the seropositive cattle; case-fatality risk was 13%. There was no evidence of benefit on infection spread of CBPP-control measures used locally by farmers (isolation or antibiotic treatments of sick animals). This might be related to a lack of power in the statistical analyses or to a quality problem for the medications used (and more generally, for health-care delivery in the Boji district). © 2004 Elsevier B.V. All rights reserved.

Mots-clés : péripneumonie contagieuse bovine; mycoplasma mycoides; Épidémiologie; symptome; Éthiopie

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