Prevalence of bovine viral diarrhea virus ...

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Title Prevalence of bovine viral diarrhea virus persistency in 12 Holstein cattle dairy herds of Charlottetown, Canada
Author(s) Arfan Ahmad, Masood Rabbani, Khushi Muhammad, M. Z. Shabbir, Tahir Yaqub, K. Munir, Fariha Akhter, A. Cepica
Journal Pakistan Journal of Zoology
Date 2011
Volume 43
Issue 2
Start page 255
End page 261
Abstract The prevalence of bovine viral diarrhea virus (BVDV) persistency was examined in 12 Holstein dairy herds in Charlottetown, Canada, from Feb. 2009 to Oct. 2009. A total of 469 serum and ear notch biopsy pairs were collected. Depending upon the age and vaccination status, the sampled animals were divided into three groups, A, B1 and B2. Group A consisted of 146 animals originating from 4 herds (≤6 month of age, FN1, FN2, FN3, FN4), group Bl comprised 267 animals representing 5 vaccinated herds against BVDV (≥6 months of age, FV1, FV2, FV3, FV4, FV5), whereas, 56 samples were taken from 3 BVDV non-vaccinated herds of group B2 (≥6 months of age, FN5, FN6, FN7). All the animals were pre-screened through serum neutralization test (SNT), whereas, all ear notch biopsies of group A (n=146) and only of those animals of group B1 (n=15) and B2 (n=37) which had SN titer ≤1:64 were processed to confirm the BVDV persistent infection. Only five animals were found positive originating from group A (n=3) and B1 (n=2) during first sampling. Upon follow up testing, two animals from each of group A and Bl remained positive confirming persistent infection (PI). A prevalence of 0.85% and 2.03% was observed in all the collected and pre screened animals, respectively. The results obtained in this study, demonstrates that the prevalence of PI animals in dairy herds of Prince Edward Island is similar to that, reported from other surveys carried out in other countries. This prevalence PI animals with BVDV in Holstein dairy herds of Charlottetown, Canada, reveal the necessity of further studying BVDV infection in the area.

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