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influenza virus type a in Medicine

influenza virus type A

n.
  1. A myxovirus of the genus Influenzavirus,antigenically varying from influenza virus types B and C, that causes acute respiratory illness in humans and infections in birds and certain other animals.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.