U.S. National Library of Medicine
Those components of an organism that determine its capacity to cause disease but are not required for its viability per se. Two classes have been characterized: TOXINS, BIOLOGICAL and surface adhesion molecules that effect the ability of the microorganism to invade and colonize a host. (From Davis et al., Microbiology, 4th ed. p486)
The numerical value of virulence factors in Chaldean Numerology is: 1
The numerical value of virulence factors in Pythagorean Numerology is: 2
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"virulence factors." Definitions.net. STANDS4 LLC, 2017. Web. 26 Apr. 2017. <http://www.definitions.net/definition/virulence factors>.