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A 46,000-year-old worm found in Siberian permafrost was brought back to life, and started having babies
(www.businessinsider.com)
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They could have also just been endemic to that area, and a host's resistance possibly linked to a recessive gene. (like sickle cell and malaria in Africa) Following their period of removal from the environment, and with the traveling and immigration of humans and other animals, those genes could be dominated by another form or missing altogether.