id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ajpf-639	Lei Han, Wenying Lu; Yifang Han; Shuhua Li; Jianhua Yin; Jiaxin Xie, Tong Su; Guangwen Cao	Evolutionary characteristics of swine-origin H1N1 influenza virus that infected humans from sporadic to pandemic	2014	17	.pdf	application/pdf	6222	274	58	Key words: Swine, H1N1 influenza virus, evolution, sporadic, pandemic. The gene segments of the swine H1N1 viruses that occasionally infected persons who ever exposed to pigs in North America before 1998 were phylogenetically linked to those of classic swine H1N1 influenza viruses.	cache/ajpf-639.pdf	txt/ajpf-639.txt