There are infinitely many things that do not contribute to the
virulence of a pathogen. Elvis does not contribute to the virulence
of a pathogen.
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Virulence - album - was created on 2007-01-23.
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The virulence factor for diphtheria is an exotoxin named
diphtheria exotoxin.
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Virulence is the degree of pathogenicity within a types of
parasites. The factors of virulence are the colonization of a niche
in the host, immunoevasion, immunosuppression, entry and exit of
cells and obtaining nutrition from the host.