Epidemiology and characterization of avian infectious bronchitis virus strains circulating in southern China during the period from 2013-2015.

ABSTRACT: Two hundred and six strains of avian infectious bronchitis virus (IBV) were isolated from chickens showing signs of disease in southern China during the period from 2013-2015. The nucleotide and amino acid sequences from the isolated field strains were compared to 42 published references. Nucleotide homologies ranged from 63.1-99.9% and amino acid homologies ranging from 60.2-100%. At least seven IBV genotypes were co-circulating in commercial chicken farms in southern China. The IBV isolates were genetically diverse and underwent continuing evolution. The QX-type, TW I-type, and 4/91-type were the most common genotypes during the three-year observation period and accounted for 88.8% of the isolated strains. Notably, the prevalence of the TW I-type strains has been increasing in recent yea

SUBMITTER: Feng K 

PROVIDER: S-EPMC5529424 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature