Influenzavirus


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Influenzavirus

 [in″floo-en´zah-vi″rus]
former genus name for the viruses that cause influenza, now found to be two different genera, which were named influenzavirus A and influenzavirus B.
Influenzavirus A a genus of viruses containing the agent of influenza A. See also influenza virus.
Influenzavirus B a genus of viruses containing the agent of influenza B. See also influenza virus.
Influenzavirus C a genus of viruses containing the agent of influenza C. See also influenza virus.

Influenzavirus

[in′flo̅o̅·en′zävi′rus]
former genus name for the viruses that cause influenza, now found to be two different genera, which are named Influenzavirus A and Influenzavirus B.

In·flu·en·za·vi·rus

(in'flū-en'ză-vī'rŭs)
The family of Orthomyxoviridae contains three genera: Influenzavirus A, B; Influenzavirus C; and "Thogoto-like viruses." Each type of virus has a stable nucleoprotein group antigen common to all strains of the type, but distinct from that of the other types; the genome is negative-sense single-stranded RNA in 6-8 segments; each also has a mosaic of surface antigens (hemagglutinin and neuraminidase) that characterize the strains and are subject to variations of two kinds: 1) a rather continual drift that occurs independently within the hemagglutinin and neuraminidase antigens; 2) after a period of years, a sudden shift (notably in type A virus of human origin) to a different hemagglutinin or neuraminidase antigen. The sudden major shifts are the basis of subdivisions of type A virus of human origin, which occur following infection of the animal host with two different strains at the same time, resulting in a hybrid virus. Strain notations indicate type, geographic origin, year of isolation, and, in the case of type A strains, the characterizing subtypes of hemagglutinin and neuraminidase antigens (e.g., A/Hong Kong/1/68 (H3 N2); B/Hong Kong/5/72).
References in periodicals archive ?
The efficacy of live attenuated, cold-adapted, trivalent, intranasal influenzavirus vaccine in children.
La influenza aviar, mas conocida como gripe del pollo, es una enfermedad viral; estos son miembros de la familia orthomyxoviridae, genero influenzavirus tipo A; estan divididos en 15 subtipos de hemaglutininas (H) del virus de la gripe: H1-H15 y 9 subtipos de neuraminidasas (N): N1-N9; hasta ahora los subtipos mas patogenos son H5 y H7.