Genetic characterization of bovine viral diarrhea virus detected in backyard cattle farms in Mexico

Infection by bovine viral diarrhea virus (BVDV) in cattle remains a source of significant economic losses for livestock producers. This virus is classified within the Pestivirus genus, including three main species: Pestivirus A (BVDV-1), Pestivirus B (BVDV-2), and Pestivirus H (HoBi-like pestivirus). Here, we performed a molecular epidemiological investigation aiming to evaluate the genetic diversity of BVDV in cattle from backyard farms in a municipality in Mexico named Tepalcingo, Morelos, with records of reproductive disorders. RT-PCR was conducted in 111 serum samples from affected cattle. Viral RNA was detected in 47.74% of the samples analyzed. Sequencing and phylogenetic analysis based on 5'UTR showed that the circulating subgenotype was BVDV-1a in all positive samples. These findings reveal the prevalence of BVDV in the surveyed population; thus suggesting a possible association with the previous records of reproductive manifestation in the herd. However, further studies are needed to confirm BVDV as the causative agent. Additionally, our results represent a helpful tool for designing control and prevention strategies accurate to the current regional epidemiological situation. Moreover, obtained information from this type of epidemiological study will assist the implementation of biosafety measures on backyard farms with limited economic resources.