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[personal profile] walkitout
I’m halfway through, and I hit a bit about Lyme disease, zoonotic disease, etc.

“Zoonotic diseases (diseases that pass from animals to people) have been around for centures — think smallpox, anthrax, or tuberculosis.”

OK. Yes, they have been around for centuries. But no fucking way _just_ centuries. I mean, I know this has been going on for _at minimum_ millenia. And then I thought, well, wait a second. When I hit that thing at grammarly asserting there was no evidence for whether sharp pointy teeth in dinosaurs means they were carnivores (there is tons — ha ha ha — of evidence in the form of in situ stomach contents of dinosaurs), I was like, really? But this time, I’m like. Nah. This has to have been going on for a really, really, really long time.

How long?

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7263064/

“Traditionally, it was thought that TB has a zoonotic origin, being acquired by humans from cattle during the Neolithic revolution. However, the biomolecular studies proposed a new evolutionary scenario demonstrating that human TB has a human origin. The researches show that the disease was present in the early human populations of Africa at least 70000 years ago and that it expanded following the migrations of Homo sapiens out of Africa, adapting to the different human groups. The demographic success of TB during the Neolithic period was due to the growth of density and size of the human host population, and not the zoonotic transfer from cattle, as previously hypothesized.”

I don’t have an opinion about how TB got started, and I sincerely doubt that anyone is going to, at this late date, convincingly prove one way or the other, _exactly_ how it got going originally. BUT, definitely tens of thousands of years of humans having TB.

What about Anthrax?

https://www.nature.com/articles/s41467-021-26854-z

“Genetic diversity of extant Bacillus strains suggests that anthrax-causing Bacillus pathogens evolved in sub-Saharan Africa15,16, likely well before humans migrated around the globe17.”

OK, and smallpox?

https://www.cnn.com/2020/07/24/health/smallpox-vikings-history-study-scn-trnd/index.html

And to be clear, like, they sequenced smallpox, so that’s not _maybe_ it’s smallpox. It’s definitely smallpox. But there are a bunch of people that think that goes much, much further back.

Anyway.

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