Two H3N2 strains of influenza A virus isolated from pigs in Japan and Thailand were characterized antigenically and genetically. A/swine/Wadayama/5/69 (isolated in Japan in 1969) was antigenically similar to a human strain, A/Aichi/2/68, while A/swine/Bangkok/9/78 (a swine isolate in Thailand) was closely related to A/Bangkok/36/78, a contemporary human isolate. Gel electrophoresis and oligonucleotide mapping of the virus RNA revealed genetic similarity between A/swine/Wadayama/5/69 and A/Aichi/2/68, and between A/swine/Bangkok/9/78 and A/Bangkok/36/78, suggesting the derivation of swine H3N2 strains from contemporary human strains.
BilleterM. A.,
ParsonsJ. T.,
CoffinJ. M.1974; The Nucleotide sequence complexity of avian tumor virus RNA. Proceedings of the National Academy of Sciences of the United States of America 71:3560–3564
HarknessJ. W.,
SchildG. C.,
LamontP. H.,
BrandC. H.1972; Studies on relationships between human and porcine influenza. 1. Serological evidence of infection in swine in Great Britain with an influenza A virus antigenically like human Hong Kong/68 virus. Bulletin of the World Health Organization 46:709–719
KundinW. D.,
EasterdayB. C.1972; Hong Kong influenza infection in swine: experimental and field observations. Bulletin of the World Health Organization 47:489–491
LaverW. G.,
WebsterR. G.1973; Studies on the origin of pandemic influenza. III. Evidence implicating duck and equine influenza viruses as possible progenitors of the Hong Kong strain of human influenza. Virology 51:383–391
NakajimaK.,
DesselbergerU.,
PaleseP.1978; Recent human influenza A (H1N1) viruses are closely related genetically to strain isolated in 1950. Nature, London 274:334–339
NeromeK.,
NakayamaM.,
IshidaM.,
FukumiH.,
ButterfieldW. K.,
WebsterR. G.,
CampbellC. H.1978; Isolation and serological characterization of influenza viruses from birds that were dead on arrival at Tokyo Airport. Archives of Virology 57:261–270
SchildG. C.,
BrandC. M.,
HarknessJ. W.,
LamontP. H.1972; Studies on relationships between human and porcine influenza. 2. Immunological comparisons of human A/Hong Kong/68 virus with influenza A viruses of porcine origin. Bulletin of the World Health Organization 46:721–728
ShortridgeK. F.,
WebsterR. G.1979; Geographical distribution of swine (HswlNl) and Hong Kong (H3N2) influenza virus variants in pigs in South East Asia. Intervirology 11:9–15
ShortridgeK. F.,
CherryA.,
KendalA. P.1979; Further studies of the antigenic properties of H3N2 strains of influenza A isolated from swine in South East Asia. Journal of General Virology 44:251–254
UedaM.,
TobitaK.,
SugiuraA.,
EnomotoC.1978; Identification of hemagglutinin and neuraminidase antigens of influenza B virus. Journal of Virology 25:685–686