influenza B

in·flu·en·za B

influenza caused by strains of influenza virus type B; outbreaks are usually more limited than those due to influenza virus type A, although infections by the two types are clinically indistinguishable; occasionally associated with Reye syndrome.

influenza B

Infectious disease An influenza virus which causes epidemics in 3-5 yr cycles. Cf Influenza A, Influenza C.

in·flu·en·za B

(inflū-enză) Influenza caused by strains of influenza virus type B; outbreaks are usually more limited than those due to influenza virus type A, although infections by the two types are clinically indistinguishable.