Received: 05-07-2021 / Accepted: 10-01-2022
The purposes of this study were to investigate duck circovirus infection and characterize some duck circovirus strains from ducks in Ha Noi. A total of 31 pool tissue samples including brain, heart, liver, spleen, lung, and the bursa of Fabricius, were collected from duck flocks farmed in Thuong Tin, Ung Hoa, and Phu Xuyen districts during April to June of 2021. All samples were collected from clinically suspected focks and diseased ducks. Polymerase chain reaction was used to detect the viral genome. The positive samples were forwarded to sequencing the partial open reading frame 1. The viral genome was detected in 22 out of 31 (70.97%) samples. Of the 7 duck farms examined, 6 flocks (85.71%) were positive for the viral genome. Genetic analysis indicated that nucleotide identity ranged from 99.48% to 99.87% among the three viral strains in this study. Phylogenetic analysis revealed that the three viral strains obtained belonged to genotype 1 and genetically related to the Chinese strains.