From Dr. Halat’s website.
Should I be bothered that his math is completely wrong? To take the more obvious example, if you have sex with 2 people who’ve each had sex with 2 people, you have been exposed to a minimum of 4 people, not 3 (unless your two partners just happened to have only had sex with each other). The math gets worse from there…
But the man has a microscope and a lab coat, so I shouldn’t complain.