Identification of an H6N6 swine influenza virus in southern China

This is the first report of avian-like H6N6 swine influenza virus from swine in southern China. Phylogenetic analysis indicated that this virus might originate from domestic ducks. Serological surveillance suggested there had been sporadic H6 swine influenza infections in this area. Continuing study is required to determine if this virus could be established in the swine population and pose potential threats to public health.

► This is the first report of avian-like H6N6 swine influenza virus from domestic pigs, and phylogenetic analysis indicated that this virus might originate from domestic ducks.
► This study suggested that the epidemic of H6 swine influenza virus has been expanding from resident birds to the swine population in southern China.
► Serological surveillance suggested there had been sporadic H6 swine influenza infections in this area.
► Due to the potential of H6 influenza A viruses causing human infection, it is possible that more transmissible H6 viruses may be generated in swine through mutations and reassortments. Continuing study is required to determine if this virus could be established in the swine population and pose potential threats to public health.