A Naturally Occurring Deletion in Its NS Gene Contributes to the Attenuation of an H5N1 Swine Influenza Virus in Chickens

Qiyun Zhu, Huanliang Yang, Weiye Chen, Wenyan Cao, Gongxun Zhong, Peirong Jiao, Guohua Deng, Kangzhen Yu, Chinglai Yang, Zhigao Bu, Yoshihiro Kawaoka and Hualan Chen

Journal of Virology 82 ( 1 ): 220 - 228 , 2008