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This is a plot point in The Accidental Time Machine: https://www.goodreads.com/book/show/21608.The_Accidental_Time_Machine; the main character
spoiler
jumps forward into the future a bunch of times, longer jumps each time, and hits a time where the human population is almost gone, and they’re like “yeah, the fucking time travelers keep showing up and bringing old diseases”:::
Also The Witcher
