Pseudorabies (PR, Aujeszky's disease) is an acute, contagious viral disease that affects a wide range of domestic and wild species. In the present study, an outbreak of PR in sheep induced by attenuated live vaccine (Bartha-K16) was diagnosed and analyzed in China. The presence of PR virus (PRV) in brain samples from infected sheep was confirmed by gC gene polymerase chain reaction amplification and PRV-like particle observation by electron microscopy. The molecular characterization of the PRV was performed with homology analysis and phylogenetic tree construction based on the gC gene. This is the first description of an outbreak of PR induced by a live attenuated vaccine (Bartha-K16), indicating that this vaccine is unsuitable for use in sheep.
As a zoonotic infectious disease, orf outbreaks have been reported in China in recent years. However, molecular epidemiology analysis has not been performed for Chinese orf virus (ORFV) strains. Here, we have identified 13 ORFVs from goats and sheep in China between 2009 and 2011. Thirty-four complete B2L sequences were used to construct a phylogenetic tree to elucidate the molecular epidemiology of ORFV in China. Nucleotide sequences of B2L genes of clinical samples and attenuated vaccine strains were aligned and compared. Three genotypes were found by molecular epidemiology analysis. Amino acid substitutions were dispersed among B2 polypeptides from wild and attenuated ORFV strains.Electronic supplementary materialThe online version of this article (doi:10.1007/s00705-013-1946-6) contains supplementary material, which is available to authorized users.
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