A particular species of virus carries a gene for salicylate hydroxylase, an enzyme that breaks down salicylic acid. Will this virus be more or less virulent to plants than other viruses?
A. more virulent
B. less virulent
C. same virulent
D. faster virulent

The biology of infection and transmission determines how virulence, or the degree to which a disease injures, kills, or otherwise lessens the fitness of its host, evolves.
A more virulent virus might be less contagious because it limits the chance of transmission by killing its host.
A host may be susceptible or resistant depending on age, the method of infection, or the characteristics of the virus, and a virus that is virulent in one environment may be harmless in another.
Based on mortality, illness, or quantifiable pathological abnormalities, virulence of a virus can be assessed in a number of ways.
here the virulence will be unaffected because every virus has a deferent degree of virulence. like can only be compared with like.

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