Antigenic Relationships of Swine Influenza Virus

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Abstract
Six strains of swine influenza virus, and 3 of human influenza A virus were studied by means of complement-fixation hemagglutination-inhibition and cross neutralization tests. The rate of elution from red cells, red cell receptor gradients and egg and mouse infectivity tests were also done. All swine strains differed from the human strains. Four American swine strains were related among themselves, but showed little resemblance to 2 from the United Kingdom. Various explanations for the relationships are suggested and discussed.