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Influenza A(H1N1) viruses of the 1977/78 outbreak: isolation and haemagglutination properties

, : Influenza A(H1N1) viruses of the 1977/78 outbreak: isolation and haemagglutination properties. Journal of Hygiene 82(1): 81-88

During the H1N1 outbreak of 1977/8, the virus was isolated in embryonated eggs from 59 out of 76 patients (78%) with the serologically confirmed infection. A similar isolation frequency has been achieved during a period of six H3N2 outbreaks since 1972/3. The H1N1 strains were isolated less frequently from late specimens (collected 4--6 days from the onset of illness) and more often only in the second passage compared with the H3N2 viruses. The new H1N1 strains resembled those prevalent in the 1950s with respect to their ability to agglutinate erythrocytes of certain laboratory animals and to be eluted from these, and thus differed from the H3N2 viruses.


PMID: 762407

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