influenza virus type A

n.

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.