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It’s A Well Known Fact That Modern Humans Interbred With Neanderthals. The Interbreeding, According To Scientists, Had Advantages As Well As Disadvantages– There Were Exchanges Of Potentially Deadly Viruses, But Also Exchange Of Protective Genes That Continue To Helped Modern Humans Fight Against Viruses. Thanks, Neanderthals, I Guess.

Deep in Human DNA, a Gift From the Neanderthals – The New York Times

https://www.nytimes.com/2018/10/04/science/neanderthal-genes-viruses.html

Long ago, Neanderthals probably infected modern humans with viruses, perhaps even an ancient form of H.I.V. But our extinct relatives also gave us genetic defenses.