> The claim makes a broad generalization about pathogens that’s not supported by science. It has been well-documented that pathogens can evolve to be more virulent. And many viruses, including HIV and Ebola, have in fact become more lethal over time.
As you note, smallpox disproves the idea that viruses automatically become mild. It had thousands of years to do so and carried a 30% mortality rate still.
No, it doesn't.
https://www.politifact.com/factchecks/2021/dec/08/facebook-p...
> The claim makes a broad generalization about pathogens that’s not supported by science. It has been well-documented that pathogens can evolve to be more virulent. And many viruses, including HIV and Ebola, have in fact become more lethal over time.
As you note, smallpox disproves the idea that viruses automatically become mild. It had thousands of years to do so and carried a 30% mortality rate still.