Immune system is not a muscle

Hi. Evolutionary biologist here. No. None of this is accurate. https://t.co/O95S4Dee39

— T. Ryan Gregory (@TRyanGregory) October 12, 2024

Just a reminder that the following are unprecedented in all of human history and pre-history:

* 8 billion hosts.
* Global travel.
* Older population thanks to long lifespans.
* Repeated infections up to several times per year.
* Extremely dense populations, mostly indoors.

🧵 pic.twitter.com/N45Ul9f6yX

— T. Ryan Gregory (@TRyanGregory) January 13, 2024