According to the Google, they are separated into 2 categories. Old world and new world. Of the new world, 2 fatalities. And it said antivenom production has been resumed. I think it was 20-30 people bitten in the U.S. each year. And somehow there's differing info on whether the bite is painless or excruciating. You'd think that would be pretty clear.
When my Labrador puppy got bit on the nose by one the puppy yipped when it hit him. He died before I could get him to the vet too. Snake was about 16 inches long.