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A comment on New HIV vaccine shows unprecedented success in preclinical study. Parent comment
Either they evolved from a different human virus, or from an animal virus.
Measles for example evolved from a livestock virus called rinderpest and lost the ability to infect cattle as it became a specialized human virus.
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Either they evolved from a different human virus, or from an animal virus.
Measles for example evolved from a livestock virus called rinderpest and lost the ability to infect cattle as it became a specialized human virus.