virulence
VEER-yuh-luhnss
/ˈvɪr.jʊ.ləns/
The severity, harmfulness, or degree of pathogenicity of a disease or biological agent; extreme bitterness or hostility in tone.
Measures the power of a microbe to cause severe harm in a host; metaphorically describes intense malice or acrimony in debate.
The story behind the word. Traced to Latin 'virulentus' (poisonous), built from 'virus' (meaning plant juice, slime, or poison). In ancient Rome, 'virus' described foul, poisonous secretions.
Word relationships
- potency: Potency refers to chemical strength or dose power; virulence refers to biological harm caused by a pathogen.
- malevolence: Malevolence refers to evil intent; virulence refers to actual biological or verbal destructiveness.
- harmlessness: Inability to cause damage or suffering.
- benignity: Gentleness or mildness without harmful consequences.
Commonly confused with
- infectioun: Infectiousness measures how easily a pathogen spreads; virulence measures how severely it damages the host once inside.
Word family
- virulent (adjective): Extremely severe or harmful in its effects; bitterly hostile.
- virulently (adverb): In an extremely harmful or hostile manner.
Collocations
- extreme virulence
- increase virulence
- virulence factor
- virulence strain
Example sentences
- "Genetic modifications increased the virulence of the viral strain, shortening incubation time to hours." Biological Threat Evaluation
- "The virulence of the diplomatic dispute heightened fears of open military confrontation." Political Analysis
Memory hook
VIRULENCE measures how poisonous a VIRUS is. Degree of biological poison.
When not to use
Do not confuse virulence (how damaging a pathogen is) with transmissibility (how easily it spreads).
Fun facts
- Pathogens often face an evolutionary trade-off: extremely high virulence can kill hosts so quickly that the pathogen fails to spread to new hosts.
Explore more words
pathogenesis, pathogen, susceptibility, toxicity, microbial, toxin
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