I don't think the oral form is used anymore in America. There are four shots before age 6. Children hate it, but it is essential.
I think he is thinking of Smallpox vaccine, which is no longer used.
You are right; they still use the oral form in other countries but not in the U.S. The oldest of my five kids was born in 1975. He never got the smallpox vaccine; they quit giving it a couple years earlier. So no one under 50 is protected.
How hilariously true.