The classic example is old world / new world diseases. I believe syphilis is largely a new world disease, and athlete's foot was largely an old-world disease, a

The classic example is old world / new world diseases. I believe syphilis is largely a new world disease, and athlete's foot was largely an old-world disease, along with of course smallpox, typhus, measles, etc. https://www.kellogg.northwestern.edu/faculty/qian/resources/NunnQianJEP.pdf https://www.kellogg.northwestern.edu/faculty/qian/resources/...