8 ms·
Those also have low breakthrough rates (assisted by high vaccination percentages), giving it relatively no opportunity to evolve. They also had millennia to rea
by manwe150 5y ago
Those also have low breakthrough rates (assisted by high vaccination percentages), giving it relatively no opportunity to evolve. They also had millennia to reach (and then work to maintain) peak fitness, while COVID is still encountering beneficial mutations somewhat frequently.
- D_Alex 5y agoPresumably also the human species had time to co-evolve some resistance to these illnesses. I shudder to think at the cost... hundreds of millions of lives for smallpox alone...