What animal did syphilis come from?

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Tags

1. #acquired
2. #cattle
3. #sexually
4. #recent
5. #chimpanzees
6. #sheep
7. #centuries
8. #aguirre
9. #syphilis
10. #deadliest
11. #migrate
12. #which
13. #humans
14. #blood
15. #hunters
16. #possibly