Don't avoid this interesting story.
"Although people mostly talk about the Black Death, plague killed millions of people through three distinct pandemics in human history: the First (541-750s), the Second (1346-1700s, beginning with the Black Death), and the Third Pandemic (1855-mid-20th century). …
"These researchers decided to focus on and distinguish human fleas due to the fact that rat fleas are known to prefer to bite rats. Theoretically, if a human flea became infected after biting an affected person, they could transmit the disease by also biting other people living in close proximity."
https://www.mcgill.ca/oss/article/medical-critical-thinking-history/youve-been-lied-about-rats-and-black-death
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