Virulence factors are molecules expressed and secreted by pathogens (bacteria, viruses, fungi and protozoa) that enable them to achieve the following: Pathogens possess a wide array of virulence factors. Some are chromosomally encoded and intrinsic to the bacteria (e.g. capsules and endotoxin), whereas others are obtained from mobile genetic eleme...
(from the article `necrotizing fasciitis`) The group A streptococci produce a variety of so-called virulence factors that permit them to evade the defense mechanisms of the host and thus cause ...
Virulence gene or genes in a pest which have not necessarily been identified but can be used for practical purposes in gene-for-gene relationships.
Any factor that enhances the ability of an infectious disease agent to infect the host and damage tissue.
product of a pathogen that assists in its ability to cause infection and disease