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- W2890858308 abstract "A number of different cell cultures were examined for their susceptibility to the influenza virus A/swine/Weybridge/86(H1N1) and A/swine/Weybridge/87(H3N2). PK1 (porcine kidney) was found to be the most susceptible to the viruses, and MDCK (canine kidney), the best cell line for primary isolation. A method of infectivity assay by immunoperoxidase in microplate cultures of MDCK cells was developed which was simple enough for routine use and practically as sensitive as the egg infectivity test. The potential risks of accidental importation of influenza infection in pig was assessed by determining the survival time of the porcine influenza virus H1N1 in pig tissues. It was found that the virus may keep its infectivity in frozen (-20°C) pig tissues for up to 15 days. The interspecies transmission of porcine influenza viruses was studied using turkeys infected with porcine influenza isolates. Although both A/swine/Weybridge/86 and A/swine/Weybridge/87 were transmitted from infected turkeys to pigs, only A/swine/Weybridge/86(H1N1) infected turkeys presented clinical signs of disease. More than 50% of the pigs presented the virus in the nostrils and/or faeces, at some time during the experiment, and all seroconverted. Transmission from these pigs to newly introduced turkeys was not observed, nor was seroconversion detected. Influenza epidemiology in Brazil was investigated by serological studies using pig sera collected in different areas of that country, using human, porcine and avian isolates of influenza viruses. Highest antibody titres were found against A/Leningrad/86(H3N2) (19%) and A/Port Chalmers/73(H3N2) (17%), but not against specific porcine isolates. Only serological evidence was found to suggest that reassortant influenza viruses occur in English pig herds. However, interspecies transmission of influenza viruses between man and pigs, and the maintenance of human strains in English pig herds was demonstrated by the isolation of two H3N2 influenza viruses very similar to A/Port Chalmers/73, present in the human population in the 1970s." @default.
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- W2890858308 date "1989-01-01" @default.
- W2890858308 modified "2023-09-23" @default.
- W2890858308 title "Studies on porcine influenza viruses." @default.
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