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Herd-level prevalence of Mycobacterium avium subspecies paratuberculosis by bulk-tank milk PCR in Fars province (southern Iran) dairy herds

Haghkhah, Masoud, Ansari-Lari, Maryam, Novin-Baheran, Amir Mansour, Bahramy, Ayatollah
Preventive veterinary medicine 2008 v.86 no.1-2 pp. 8-13
herd health, dairy cows, disease prevalence, Mycobacterium avium subsp. paratuberculosis, bulk milk, paratuberculosis, polymerase chain reaction, dairy herds, cross-sectional studies, epidemiological studies, Iran
A cross-sectional study was conducted from March to August 2006 in dairy herds in Fars province, southern Iran to determine the herd-level prevalence of Mycobacterium avium subspecies paratuberculosis (MAP) infection. Bulk-tank milk samples were collected from 110 dairy herds in the 3 districts (Shiraz, Marvdasht and Sepidan) of the province. Among study populations, 12 herds (11%, 95%CI: 5-17%) were positive for MAP infection based on IS900 nested PCR. The prevalence of positive milk samples in the three districts of Fars province was different ranging from 8.6% to 23% which was not statistically significant (P =0.19). It is recommended to conduct further epidemiologic studies to determine cow-level prevalence and risk factors for infection, and to evaluate the economic consequences of the MAP infection in the region.