characterization of a human h9n2 influenza virus isolated in hong kong. | two h9n2 viruses were isolated, for the first time, from humans in hong kong in 1999. isolation of influenza viruses with a novel subtype of the hemagglutinin (ha) drew attention of health care authorities worldwide from the view of pandemic preparedness. sequence analysis of the ha genes reveals that ha of a/hong kong/1073/99 (h9n2) is most closely related to that of a/quail/hk/g1/97 (h9n2) that contains the internal genes similar to those of hong kong/97 (h5n1) viruses. phylogenetic and antige ... | 2001 | 11567756 |