Prevalence of Persistent Bovine Viral Diarrhea Infection in Industrial Dairies of Tehran and Alborz Province, Iran

Background and aims: bovine viral diarrhea virus (bvdv) is considered as worldwide and economically significant infection. the aim of this study was to estimate prevalence of persistent bovine viral diarrhea infection (pi) in industrial dairies of tehran and alborz province, iran. materials and methods: in this cross-sectional study, 102371 blood samples were collected from cattles of industrial dairies of tehran and alborz province during 2018. indirect enzyme-linked immunosorbent assay (elisa) and reverse transcription-polymerase chain reaction (rt-pcr) were performed for determination of viral genotypes, including bvdv1, bvdv2, and hobi like among pi samples. results: a total of 102371 samples were collected from 76 industrial dairies in tehran and alborz province, that 512 cases were pi. all samples were positive for bvdv1 (100%). other genotypes were not found among pi samples. conclusion: prevalence of persistent bovine viral diarrhea infection in industrial dairies in tehran and alborz was not high. however, it will be further decreased by implementing control and eradication programs.