id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-279495-zxerb7de	Liu, Xiaoli	Comparative analysis of four Massachusetts type infectious bronchitis coronavirus genomes reveals a novel Massachusetts type strain and evidence of natural recombination in the genome	2012-11-21		.txt	text/plain	5235	258	56	Four Massachusetts-type (Mass-type) strains of infectious bronchitis coronavirus (IBV) were compared genetically with the pathogenic M41 and H120 vaccine strains using the complete genomic sequences. Phylogenetic analysis, and pairwise comparison of full-length genomes and the nine genes, identified the occurrence of recombination events in the genome of strain CK/VH/LHLJ/07VII, which suggests that this virus originated from recombination events between M41and H120-like strains at the switch site located at the 3′ end of the nucleocapsid (N) genes. Herein, we sequenced the complete genome of four IBV Mass-type strains that showed S1 gene diversity (Liu et al., 2009; Ma et al., 2012; Sun et al., 2011) , and we present evidence for in-field recombination between pathogenic and vaccinal strains. Sequence evidence for RNA recombination in field isolates of avian coronavirus infectious bronchitis virus	./cache/cord-279495-zxerb7de.txt	./txt/cord-279495-zxerb7de.txt