influenza A


influenza A
influenza A -'ā n a common moderate to severe respiratory disease that affects humans and some other vertebrates (as swine and birds) sometimes in pandemics following mutation in the causative virus, that in humans is characterized by sudden onset, fever, prostration, severe aches and pains, and progressive inflammation of the respiratory mucous membranes, that is held to have aquatic birds as its natural and historic host, and that has numerous variants caused by subtypes (as H1N1, H2N2, or H3N2) of an orthomyxovirus (species Influenza A virus of the genus Influenzavirus A) distinguished esp. by mutations of a hemagglutinin (as H1, H2, or H3) affecting the ability of the virus to infect cells and of a neuraminidase (as N1 or N2) involved in release of the replicated virus from cells see avian influenza, swine influenza;, asian flu, hong kong flu, spanish flu

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the most common variety of influenza, caused by Influenzavirus A; epidemics occur at two- to three-year intervals. The causative strain has wide variations in antigenic type (see antigenic shift, under shift). Outbreaks caused by various antigenic types have been given the names Asian i., Spanish i., Russian i., and others.

Medical dictionary. 2011.

Look at other dictionaries:

  • influenza — [ ɛ̃flyɑ̃za; ɛ̃flyɛnza ] n. f. • 1782; it. influenza « écoulement de fluide, influence », d où « épidémie » ♦ Vieilli Grippe. ● influenza nom féminin (anglais influenza, de l italien influenza) Synonyme vieilli de grippe. ● influenza (synonymes)… …   Encyclopédie Universelle

  • influenza B — bē n influenza that is usu. milder than influenza A, that may occur in epidemics but not pandemics, and that is caused by an orthomyxovirus (species Influenza B virus of the genus Influenzavirus B) infecting only humans and esp. children and… …   Medical dictionary

  • influenza C — sē n influenza that is restricted to humans, that usu. occurs as a subclinical infection, that occurs in neither epidemics or pandemics, and that is caused by an orthomyxovirus (species Influenza C virus of the genus Influenzavirus C) * * *… …   Medical dictionary

  • Influenza — Sf Grippe per. Wortschatz fach. (18. Jh.) Entlehnung. Entlehnt aus it. influenza, eigentlich Einfluß (der Sterne) , dieses aus ml. influentia Einfluß , zu l. influere hineinfließen , zu l. fluere fließen und l. in . Seit dem 15. Jh. bedeutet das… …   Etymologisches Wörterbuch der deutschen sprache

  • influenza — 1743, borrowed during an outbreak of the disease in Europe, from It. influenza influenza, epidemic, originally visitation, influence (of the stars), from M.L. influentia (see INFLUENCE (Cf. influence)). Used in Italian for diseases since at least …   Etymology dictionary

  • Influenza — In flu*en za, n. [It. influenza influence, an epidemic formerly attributed by astrologers to the influence of the heavenly bodies, influenza. See {Influence}.] (Med.) An epidemic viral infectious disease characterized by acute nasal catarrh, or… …   The Collaborative International Dictionary of English

  • Influenza — Influenza, 1) so v.w. Grippe; 2) seuchenartiges Katarrhalfieber der Pferde; tritt sehr versteckt auf, verläuft schnell u. ist gefährlich. Sie tritt theils als rheumatische, theils als katarrhalische, theils als gastrische Form auf. Das Thier… …   Pierer's Universal-Lexikon

  • influenza — (Del it. influenza). f. gripe …   Diccionario de la lengua española

  • influenza — ► NOUN ▪ a highly contagious infection of the respiratory passages, spread by a virus and causing fever, severe aching, and catarrh. DERIVATIVES influenzal adjective. ORIGIN Italian, influence, outbreak of an epidemic , from Latin influere flow… …   English terms dictionary

  • Influénza — (ital), soviel wie Grippe (s. d.). – Als I. der Pferde bezeichnete man früher verschiedene fieberhafte akute Infektionskrankheiten, die heute wissenschaftlich als Brustseuche, Pferdestaupe und Skalma unterschieden werden. Der Name I. ist damit… …   Meyers Großes Konversations-Lexikon


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