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The complete nucleotide sequence of the viral protein 2 (VP2) ORF was determined for 26 Vietnamese infectious bursal disease isolates collected from clinical outbreaks in vaccinated flocks from 1987 to 2018 and two commercial vaccine specimens. These sequences were compared for molecular classification with 42 reference strains representing all four main classes of serotype 1, including very virulent...
Eight Vietnamese Newcastle disease virus field isolates from 2008–2015 and 3 vaccine specimens were genotyped based on their full F gene sequences and compared to 80 reference strains representing all 18 genotypes. Three isolates formed a novel subgenotype XIId, identified for the first time in Vietnam; while the others clustered as follows: four in subgenotypes VIId and VIIh; two in Genotype I; and...