Abstract

From 6 October 1972 to 3 December 1972, 41 type-A influenza virus isolants were recovered from free-flying wild ducks, and 7 isolants from domestic ducks in southern California. The typespecific antigen (ribonucleoprotein) was identified by the agar-geldiffusion test, and tentative identification of one strain-specific antigen (hemagglutinin) was attempted by the hemagglutinationinhibition test. These isolants support the theories that wild birds play an important role in the dissemination of type-A influenza viruses and may provide optimum conditions for genetic interaction of type-A influenza viruses, resulting in new hybrid strains.

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