I believe you’re asking where STDs originated. I’d say look them each up the way I looked up Chlamydia. I typed “where did Chlamydia originate” and it says;
Chlamydia pneumoniae was originally an animal pathogen that crossed the species barrier to humans and had adapted to the point where it could now be transmitted between humans. “What we think now is that Chlamydia pneumoniae originated from amphibians such as frogs,” he said.
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