imported parakeets harbor h9n2 influenza a viruses that are genetically closely related to those transmitted to humans in hong 1997 and 1998, h9n2 influenza a viruses were isolated from the respiratory organs of indian ring-necked parakeets (psittacula krameri manillensis) that had been imported from pakistan to japan. the two isolates were closely related to each other (>99% as determined by nucleotide analysis of eight rna segments), indicating that h9n2 viruses of the same lineage were maintained in these birds for at least 1 year. the hemagglutinins and neuraminidases of both isolates showed >97% nucleotide ident ...200111238878
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