Lack of Evidence for Human-to-Human Transmission of Avian Influenza A (H9N2) Viruses in Hong Kong, China 1999 oleh Timothy M. Uyeki, Yu-Hoi Chong, Jacqueline M. Katz, Wilina Lim, Yuk-Yin Ho, Sophia S. Wang, Thomas H.F. Tsang, Winnie Wan-Yee Au, Shuk-Chi Chan, Thomas Rowe, Jean Hu-Primmer, Jensa C. Bell, William W. Thompson, Carolyn Buxton Bridges, Nancy J. Cox, Kwok-Hang Mak, Keiji Fukuda