Your premise implies the easier the contagion, the more deadly the virus.
100 million deaths from the plague is is quite amazing even in terms of contagion actually. No one is surprised at the elevated contagion levels in NYC. People live on. Top of each other. But the living situation during the plague is nowhere near comparable to NYC. The major cities had a fraction of the population. So, to get to 100 million you can’t get there by adding up the major city populations at the time of the plague.
I think you have to look at the infection strength of the disease and the average immunity level of the population who is in contact with the disease.
Which begs the question is the average immunity level of the world population today stronger than in the time of the plague, or is this covid virus lacking the infectious strength compared to the plague.
We Not Me
