Majid Hashemi - Shiraz Branch, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Shiraz, Iran.
Mehran Bakhshesh - Department of Animal Virology, Research and Diagnosis, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.
Mohsen Manavian - Shiraz Branch, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Shiraz, Iran.

The seroprevalences of BRSV, BPIV-۳, and BAV-۳ were studied in the dairy cattle of Fars Province in the south of Iran and their associated risk factors were determined. Serum samples (n = ۴۲۰) were collected from ۳۶ cattle herds in the northern, central, and southern regions of the study area. Commercial enzyme-linked immunosorbent assay kits were used to detect antibodies against these viruses. The Chi-square test and logistic regression were used to identify potential risk factors. Antibodies were estimated ۱۰۰% for all the studied viruses at the herd level and ۷۶.۴۳%, ۷۶.۹۰%, and ۹۲.۶۲% at the animal level for BRSV, BPIV-۳, and BAV-۳, respectively. In logistic regression analysis, age for all the viruses, season for BPIV-۳ and BAV-۳, and region and farming type for BAV-۳ were significantly related to seroprevalence at the animal level. A significant association of dual infections with studied viruses was identified. The present study demonstrated that BRSV, BPIV-۳, and BAV-۳ are very prevalent in the dairy herds of southern Iran and highlighted the necessity to establish a control program.

Seroprevalence, Bovine respiratory syncytial virus, Bovine parainfluenza virus-۳, Bovine adenovirus-۳