Primate foamyviruses can infect humans harmlessly, but researchers fear they may evolve to become dangerous.
灵长类泡沫病毒可以感染人类但无害，但研究人员担心它们可能会演变成具有危险性。
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Aris Katzourakis, an evolutionary biologist at the University of Oxford, and his colleagues recently went on a hunt for fossils of foamyviruses in mammals.