Epidemic friendly time traveller

My time traveller from the distant future is about to get stranded back in time, but realises that by travelling back a short time, maybe 100000 years, he is going to leave a trail of destruction by introducing a swathe of advanced diseases among the local populations.

He figures that all he has to do is travel back further: to a point where the proteins and receptors his viruses need haven't been evolved yet. However, he still wants to be able to interact with the inhabitants, so he wants to travel back as little as possible in the hopes of having someone/something sapient to talk to.

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Epidemic friendly time traveller

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