symbiont-mediated modulation of host virulence
A process by which a virus improves the virulence of its host for that host's respective host. Common in but not limited to bacteriophages; also occurs in phage-bearing bacteria infecting plants or animals for example. Mechanisms include the expression of factors that modulate a bacterial adhesion to a host cell, spread through host tissues, production of exotoxins or provide protection against host immune defenses.
GO:0044003
symbiont-mediated perturbation of host process
is_a
modulation of host virulence by virus
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