Abstract
Conclusions
1. A strain of swine influenza virus (Oti), isolated in 1939, has been re-investigated by serological means and found antigenically to resemble some members of the human A-prime influenza virus group.
2. Significant increases in the levels of anti-body against this swine strain of influenza virus were detected in the convalescent blood specimens of children who had had experience during the A-prime influenza epidemic of early 1947. High titers of antibody were also found against the current A-prime strains.
3. Adults involved in the same epidemic also showed significant antibody increases against the same swine strain and the current A-prime and Type A strains.
4. Results of cross hemagtglutination inhibition tests with specific ferret anti-sera supported the observations made from the serological tests with human sera.
5. The relationship of this swine strain to members of the A-prime group has been discussed.
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