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Bacterial Virulence Factor

Molecular classification: Toxin, Enzyme, Adhesin, Invasin, Capsule, Regulatory System

Overview

A bacterial virulence factor is any molecule, structure, or regulatory system produced by bacteria that enables them to colonize a host, evade or suppress the host immune response, obtain nutrients from the host, and ultimately cause disease. These factors are essential for bacterial pathogenicity—the ability of bacteria to cause disease in a susceptible host. Examples include toxins, enzymes, adhesins, invasins and capsules.

Mechanism of action

Inhibition of virulence factor production/activity; disruption of bacterial colonization; enhancement of host immune response

Biological functions

ColonizationImmune evasionImmune suppressionNutrient acquisitionTissue adhesionHost cell entryQuorum sensingRegulation of gene expression

Disease associations

InfectionBacterial pathogenesis

Safety considerations

Development of resistanceOff-target effects on commensal bacteriaPotential for immune-mediated pathology

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