There have been dozens, up to 34 outbreaks since 1976, a half dozen where the infected reach into the multiple hundreds, and more that exceeded a 100, and many more that were in the dozens.
In Africa, under African conditions. Thousands dead, but not many thousands.
How many millions do you expect it to kill in America?
It's exponential. 2 becomes 4 becomes 8 becomes 16 becomes 32 becomes 64...etc. etc. But you never really answered my question: Why do you think it will NOT kill millions at least in Africa? What is going to stop it? There is no cure. It's not contained. The healthcare systems have collapsed. The economies are near collapse and people are still traveling. What will stop it from killing millions?
How many millions do you expect it to kill in America?
That depends on two things. One is our culture. We take care of sick loved ones. We hold them, we comfort them, we kiss them, we hug them. That's not going to stop. Our culture is also to bring really sick people to hospitals. That will overwhelm our health care systems just as fast. Doctors and nurses will die first just as they did in Africa. Our culture is not going to change overnight so I don't see that we have any advantage here over Africa.
The only other thing that could possibly stop it is if it evolves to where it's not deadly. That's the only thing that stopped the Spanish flu. If that had not happened there would likely have been many more millions, if not billions, killed.
Many of them were secondary outbreaks due to needle accidents, lab accident, secondary infections and animal only outbreaks.