33. The avian flu virus H5N1 is considered a greater long-term threat than the swine flu virus H1N1 because __________.
(A) it has a significantly higher mortality rate
(B) H5N1 has a greater tendency to become a prophage
(C) more people eat chicken meat than pork
(D) it is more readily transmitted between human hosts
(E) H5N1 is a DNA virus and the similarity of genome chemistry can promote greater virulence and therefore the likelihood of death in humans.
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