Hong KongRift Valley FeverRift Valley fever virusrac GTP-Binding ProteinsEncephalitis Virus, Murray ValleyChinaInfluenza, HumanInfluenza A virusInfluenza A Virus, H9N2 SubtypeDisease OutbreaksHemagglutination Inhibition TestsSevere Acute Respiratory SyndromeInfluenza A Virus, H5N1 SubtypeOrthomyxoviridaeEncephalitis, ArbovirusAsian Continental Ancestry Group