An antigenically distinct subtype of influenza virus A which is virulent for mice in primary passage of allantoic fluid.

Abstract

SCIENCE, founded in 1880, is published each Friday by the American Association for the Advancement of Science at the Business Press, 10 McGovern Ave., Lancaster, Pa. Entered as secondl-cylss matter at the Post Office at Lancaster, Pa., January 13, 1948, under the Act of March 3, 1879. Acceptance for mailing ait the special rate postage provided for in the… (More)

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