Virulence refers to the degree of pathogenicity manifested by a microbe, not simply whether or not it causes disease.

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Virulence is a measure of how severe the disease caused by a microbe is, and not necessarily whether or not the microbe causes disease. Virulence can be influenced by factors such as the ability of the microbe to invade host tissues, produce toxins, evade the immune system, and replicate rapidly.

Virulence Refers to the Degree of Pathogenicity Manifested by a Microbe