Abstract:

The aim of this study was to investigate the distribution of serovars and virulent genes of yak Salmonella from the some areas of the Qinghai-Tibetan pleteau. The serotyping result exhibited that the 31 yak Salmonella isolates were divided into 8 different serovars, S. Dublin (32.26%), S. Enterica (29.03%) and S. Typhimurium (12.90%) were dominant serovars, other are S. Blegdam, S. Onarimon, S. Stanely, S. Orion and S. Newport. In addition, the 14 different virulent genes were detected in 31 yak Salmonella isolates by PCR method. The results showed all isolates carried virulent genes of the pathogenicity island-1 (SPI-1) to SPI-5, and the five serovars yak Salmonella isolates carried the virulence plasmid. It is noteworthy that the S. Blegdam and S. Onarimon were first found to possess the virulence plasmid. Therefore, the high carrying rate of virulence plasmid was occurred in yak Salmonella suggested that the yak Salmonella might have strong pathogenicity, which will provide important information to further study the pathogenicity of yak Salmonella from the Qinghai-Tibetan pleteau.