The answer is:
Because they are likely to change more than one animo acid
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Designing efficacious norovirus vaccines remains a major challenge due to several factors:
(1) the extreme genetic variability within the norovirus family and within genogroups
(2) the rapid evolution of antigenically dissimilar pandemic GII.4 norovirus strains
(3) the lack of lasting immunity upon natural exposure to noroviruses in at least a proportion of the population.
Answer:
that's very broad, is that the whole question?
i think it is D) stays the same, decreases. because it sound right to me.
Answer:
DNA is found in the nucleoid
