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  • Title: Multiple variants of African swine fever virus circulating in Vietnam.
    Author: Nguyen VT, Cho KH, Mai NTA, Park JY, Trinh TBN, Jang MK, Nguyen TTH, Vu XD, Nguyen TL, Nguyen VD, Ambagala A, Kim YJ, Le VP.
    Journal: Arch Virol; 2022 Apr; 167(4):1137-1140. PubMed ID: 35190886.
    Abstract:
    African swine fever (ASF) is a contagious and deadly viral disease affecting swine of all ages. ASF was first reported in Vietnam in February 2019, and it is now considered endemic in Vietnam. In this study, 122 ASF-positive samples collected from domestic pigs in 28 different provinces of northern, central, and southern Vietnam during outbreaks in 2019-2021 were genetically characterized. The findings confirmed that all ASF virus (ASFV) strains circulating in Vietnam belonged to p72 genotype II, p54 genotype II, CD2v serogroup 8, and CVR gene variant type I. However, further analysis based on the tandem repeat sequences located between I73R and I329L genes revealed that there were three different variants of ASFV, IGR I, II, and III, circulating in the domestic pig population in Vietnam. The IGR II variants were the most prevalent (117/122 strains) and were detected in pigs in all of the provinces tested, followed by IGR III (4/122 strains) and IGR I (1/122 strains). This study confirms for the first time the presence of IGR III variants in Vietnam.
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