Multiple Choice
Which of the following hypothetical viruses would likely show a "cactus-shaped" population phylogeny?
A) A mutualistic virus that is vertically transmitted
B) A highly virulent virus, like Ebola, that kills its host before the build-up of any immunity
C) A highly virulent virus that results in life-long immunity and that can only infect naïve individuals (e.g., young children) that have never encountered any of the virus's strains
D) A virus that can reinfect previously infected hosts via escape mutants
Correct Answer:

Verified
Correct Answer:
Verified
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