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influenza virus type B

n.
  1. A myxovirus of the genus Influenzavirus, antigenically varying from influenza virus type A and influenza virus type C, that causes various respiratory illnesses in humans.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.