Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5801020 | Veterinary Microbiology | 2013 | 8 Pages |
An infectious bronchitis virus (IBV), ck/CH/LZJ/111113, was isolated from a H120-vaccinated chicken which showed disease suspected of IBV infection. Neutralization testing showed that ck/CH/LZJ/111113 was distinct from either the Chinese predominant IBV LX4-type or Mass-type vaccine strains. Phylogenetic analysis confirmed that ck/CH/LZJ/111113 is of the 4/91 type; however, further extensive analyses of full-length genomes identified occurrence of recombination events. Therefore, ck/CH/LZJ/111113 originated from the recombination events between ck/CH/LDL/091022- and 4/91-like strains at three switch sites located upstream of the spike (S) glycoprotein gene, and the 3â² ends of S1 and nuceocapsid (N) genes, respectively. The difference of serotypes and tissue tropisms in kidneys between ck/CH/LZJ/111113 and ck/CH/LDL/091022 may have been contributed by the uptake of the S1 gene by a ck/CH/LDL/091022-like virus from a 4/91-like strain. This recombination event took place at the 3â² end of the N gene and the 3â² untranslated region may account for differences in replication efficiency in tissues of chickens inoculated by the two viruses.