Emergence of novel nephropathogenic infectious bronchitis viruses currently circulating in Chinese chicken flocks

The emergence of novel infectious bronchitis viruses (IBVs) has been reported worldwide. Between 2011 and 2014, eight IBV isolates were identified from disease outbreaks in northeast China. In the current study we analysed the S1 gene of these eight IBV isolates in addition to the complete genome of five of them. We confirmed that these isolates emerged through the recombination of LX4 and Taiwan group 1 (TW1) viruses at two switch sites, one...