Abstract
This article presents the results of a serological study of seroprevalence for the causative agent of infectious bovine rhinotracheitis (IBR) conducted in 2021-2022 in the Akmola, Kostanay, Pavlodar and North Kazakhstan regions of Kazakhstan. The data were obtained using the enzyme immunoassay (ELISA), which allows to determine the presence of antibodies to the BoHV-1 virus in the animal blood serum. During the period 2021-2022, 582 heads of cattle were examined, of which 497 (85.4%) had antibodies to BoHV-1. In 2021, 365 (87.5%) showed a positive result, the highest seroprevalence was recorded in the Pavlodar region, where all 154 examined animals had antibodies to the virus. In 2022, the study covered 165 cattle, of which 132 (80%) showed a positive result. In the Akmola region, seroprevalence remained at a high level (95.6%), and in the Pavlodar region, it amounted to 80%. A decrease in the level of seroprevalence was recorded in the Kostanay (45%) and North Kazakhstan (56.7%) regions. The results of the study confirm the circulation of the IBR causative agent observed in 2021 in the Pavlodar, Akmola, Kostanay, and North Kazakhstan regions, emphasizing the need for continuous monitoring in farming households. The authors of the article recommend vaccination against BoHV-1 as an important preventive measure.