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|Title: ||Caseous lymphadenitis in sheep flocks of the state of Minas Gerais, Brazil: Prevalence and management surveys|
|Other Titles: ||Small Ruminant Research|
|Authors: ||Guimarães, A. S.|
Bastos, Bruno Lopes
Portela, Ricardo Wagner Dias
Nascimento, Roberto José Meyer
Carmo, Filipe B.
Cruz, J. C. M.
McCulloch, J. A.
Lage, Andrey Pereira
Heinemann, M. B.
Azevedo, Vasco Ariston de Carvalho
Gouveia, A. M. G.
|Keywords: ||Corynebacterium pseudotuberculosis;Caseous lymphadenitis;Sheep;Prevalence;Minas Gerais;Epidemiology;Brazil|
|Issue Date: ||Nov-2009|
|Abstract: ||Corynebacterium pseudotuberculosis is the etiologic agent of caseous lymphadenitis, which is a serious, economically important problem for sheep production. We examined the seroprevalence of infection by C. pseudotuberculosis and possible risk factors associated with caseous lymphadenitis in sheep herds of the state of Minas Gerais, Brazil. Samples were collected from 642 sheep from 97 farms. Sera of all of the sheep were tested with ELISA for antibodies against C. pseudotuberculosis. A questionnaire was applied to gather data on the farm, the sheep herd, the farmer, and individual animal data (breed, sex and age). This is the first sero-epidemiological survey for caseous lymphadenitis in sheep herds in Minas Gerais. We found a high real prevalence, much higher than that suggested from information obtained with the questionnaire, which points to the scarcity of vaccination against caseous lymphadenitis in the sample evaluated. Only a small proportion of the farmers declared that cases of this disease were present in their flocks. The frequency of seropositive sheep varied significantly with breed (χ2 test, P = 0.021). Age group also significantly affected the percentage of seropositivity (χ2 test, P = 0.049), the highest frequency being found in adult animals (more than 12 months old), when compared to the 5–12 months old group (χ2 test, P = 0.021). The prevalence of infection with C. pseudotuberculosis in sheep in the state of Minas Gerais was estimated to be 70.9% (95% confidence interval (CI): 64.7–77.0%) and the prevalence of infected flocks being 95.9% (95% CI: 89.8–98.9%). We concluded that C. pseudotuberculosis infection is widely disseminated in sheep flocks in Minas Gerais and that caseous lymphadenitis control and eradication programs are necessary in this state.|
|Description: ||Trabalho completo: completo restrito, p.86–91|
|Appears in Collections:||Artigos Publicados em Periódicos Estrangeiros (ISC)|
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