The ability of any agent of infection to produce disease. The virulence of a microorganism (such as a bacterium or virus) is a measure of the severity of the disease it is capable of causing. The adjective virulent implies extremely noxious, damaging, deleterious, disease-causing (pathogenic). Marked by a rapid, severe, and malignant course. Poisonous, venomous. The word “virulence” comes from the Latin “virulentia” from “virus” meaning a slimy liquid, particularly one that is foul and poisonous.
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The disease-evoking severity of a pathogen; numerically expressed as the ratio of the number of cases of overt infection to the total number infected, as determined by immunoassay. [L. virulentia, fr. virulentus, poisonous]

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vir·u·lence 'vir-(y)ə-lən(t)s n the quality or state of being virulent: as
a) relative severity and malignancy <ameliorate the \virulence of a disease>
b) the relative capacity of a pathogen to overcome body defenses compare INFECTIVITY

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the disease-producing (pathogenic) ability of a microorganism. See also attenuation.

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vir·u·lence (virґu-ləns) [L. virulentia, from virus poison] the degree of pathogenicity of a microorganism as indicated by the severity of the disease produced and its ability to invade the tissues of a host. It is measured experimentally by the median lethal dose (LD50) or median infective dose (ID50). 1. by extension, the competence of any infectious agent to produce pathologic effects.

Medical dictionary. 2011.

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  • virulence — [ virylɑ̃s ] n. f. • v. 1370 « pus »; rare av. XVIIIe; lat. virulentia « infection » 1 ♦ Méd. Vx Caractère virulent. « La virulence de ses humeurs » (Voltaire). ♢ Fig. Âpreté, violence. Virulence d une critique. « Bien qu ils protestent avec… …   Encyclopédie Universelle

  • Virulence — (also called pestiferousness) refers to the degree of pathogenicity of a microbe, or in other words the relative ability of a microbe to cause disease.The word virulent , which is the adjective for virulence, derives from the Latin word… …   Wikipedia

  • Virulence — Vir u*lence, Virulency Vir u*len*cy, n. [Cf. F. virulence, L. virulentia an offensive odor, a stench.] 1. The quality or state of being virulent or venomous; poisonousness; malignancy. [1913 Webster] 2. Extreme bitterness or malignity of… …   The Collaborative International Dictionary of English

  • virulence — virulence. См. вирулентность. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • virulence — index fatality, force (strength), harm, rancor, severity, spite Burton s Legal Thesaurus. William C. Burton …   Law dictionary

  • virulence — (n.) 1660s (virulency attested from 1610s), from L. virulentia, from virulentus (see VIRULENT (Cf. virulent)) …   Etymology dictionary

  • virulence — [vir′yo͞olən sē, vir′oolən sēvir′yoo ləns, vir′ooləns] n. [LL virulentia] 1. the quality of being virulent, or very poisonous, noxious, malignant, etc. 2. bitter animosity; venom; rancor 3. the relative infectiousness of a microorganism causing… …   English World dictionary

  • Virulence — Sur les autres projets Wikimedia : « Virulence », sur le Wiktionnaire (dictionnaire universel) La virulence désigne le caractère pathogène, nocif et violent d un micro organisme (bactérie ou champignon). La virulence d un pathogène …   Wikipédia en Français

  • virulence — (vi ru lan s ) s. f. 1°   Qualité de ce qui est virulent. •   Ces bruits [sur la phthiriase] ont fait croire qu Hérode faisait égorger des enfants pour se baigner dans leur sang, et adoucir par ce remède la virulence de ses humeurs, VOLT. Philos …   Dictionnaire de la Langue Française d'Émile Littré

  • virulence — [[t]vɪ̱rjʊləns[/t]] 1) N UNCOUNT: oft N of n Virulence is great bitterness and hostility. [FORMAL] The virulence of the café owner s anger had appalled her. 2) N UNCOUNT The virulence of a disease or poison is its ability to harm or kill people… …   English dictionary

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