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KMID : 1023520220450030211
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Korean Journal of Veterinary Service
2022 Volume.45 No. 3 p.211 ~ p.219
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Prevalence study of bovine viral diarrhea virus (BVDV) from cattle farms in Gyeongsangnam-do, South Korea in 2021
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Son Yong-Woo
Cho Seong-Hee
Ji Jeong-Min
Cho Jae-Kyu
Bang Sang-Young
Choi Yu-Jeong
Kim Cheol-Ho
Kim Woo-Hyun
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Abstract
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Bovine viral diarrhea (BVD) is one of the problematic wasting diseases in cattle leading to huge economic losses. This study was conducted to investigate the prevalence of BVD including transient and persistent infection from cattle farms in Gyeongsangnam-do. A total of 2,667 blood samples from 24 farms were collected and the sera were subjected to ELISA to detect BVD virus (BVDV) antigen, Erns. 5' untranslated region (5'-UTR) of BVDV-positive samples was sequenced to identify the genotype, and compared with isolates previously reported elsewhere. There were fourteen BVDV-positive calves from 2,667 samples (positive rate: 0.52%) from first ELISA testing followed by eight persistently infected out of eleven BVDV-positive samples (72.73%) in secondary ELISA that was conducted in at least four weeks suggesting the circulation of BVDV in the area. Sequencing analysis exhibited that thirteen BVDV-positive samples were identified as BVDV-1b and one sample was BVDV-2a. Phylogenetic analysis revealed that the BVDV-1b-positive samples showed the highest homology in nucleotide sequence to Korean isolates collected from Sancheong, Gyeongsangnam-do, while the BVDV-2a-positive sample (21GN7) was more similar to reference strains collected outside South Korea. This study will provide the recent fundamental data on BVD prevalence in Gyeongsangnam-do to be referred in developing strategies to prevent BVDV in South Korea.
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KEYWORD
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Bovine viral diarrhea virus, Persistent infection, Genotype, South Korea
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