I think we would all be shocked to know the true number of people that were infected and never got tested. They will hopefully be immune. I'm pretty sure this includes myself.
I don't know in the States, but in Europe they're underreporting the dead. Not due to some dark conspiracy, but because they're overrun so they only count the cases of people who die in hospitals after getting tested. In France and Spain for instance, based on yearly statistics, they have an extra couple of hundred of people dying daily at home or in care centers that are not being counted because at the moment they lack the resources to conduct full autopsies. So they expect they will have to add a couple of thousand casualties.
It defies belief that the rest of the world has already 10 times more casualties than China, when we had a couple of months to prepare for this.