A new genotype of nephropathogenic infectious bronchitis virus circulating in vaccinated and non-vaccinated flocks in China

文献类型： 外文期刊

第一作者： Liu, SW

作者： Liu, SW;Kong, XG

作者机构：

期刊名称：AVIAN PATHOLOGY （ 影响因子：3.378； 五年影响因子：3.237 ）

ISSN： 0307-9457

年卷期： 2004 年 33 卷 3 期

页码：

收录情况： SCI

摘要： Five strains of infectious bronchitis virus (IBV) were isolated from five layer flocks that had nephropathogenic infection in four provinces in China. Among them, three of the five flocks had been vaccinated against infectious bronchitis. Virulence studies indicated that the five Chinese IBV isolates caused 10 to 30% mortality in 15-day-old specific pathogen free chickens and gross lesions were mainly confined to the kidneys in all of the dead chickens. Two oligonucleotide pairs, S1Uni2 and S1Oligo3' or S1Oligo5' and S1Oligo3', were used after propagation of the isolates in embryonated eggs to amplify the S1 protein genes of the spike protein. The cDNA derived by reverse transcriptase-polymerase chain reaction was cloned and sequenced. The nucleotide and amino acid sequence of S1 protein gene had a similar degree of identity (greater than or equal to 92%) among the five Chinese IBV isolates. The nucleotide and amino acid identity of the S1 protein gene between the five Chinese IBV isolates and 16 strains of other IBVs varied from 60 to 81%. This clearly showed that the five Chinese IBV isolates comprised a separate genotype. These results demonstrated, for the first time, that there is a new genotype of nephropathogenic IBV circulating in vaccinated and non-vaccinated flocks in China.

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