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influenza virus

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n.
Any of three viruses of the genus Influenzavirus designated type A, type B, and type C, that cause influenza and influenzalike infections.
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Medical definitions for influenza virus (2 of 2)

Influenzavirus
[ ĭn′flōō-ĕnzə-vī′rəs ]

n.
A genus of the Orthomyxoviridae family, including the viruses that cause influenza A and B; each type has a stable nucleoprotein group antigen common to all strains of the type, but distinct from that of the other type.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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