They use cow pox to immunize against small pox. The guys on their first tour got about 3 “jabs.” Since I had been previously immunized I got around 21.
If small pox is wiped out why did I have to get immunized?
I was immunized as a baby (born in 1955). Everybody was immunized until sometime in the 1970’s. Son was immunized while in the navy (2005-2008) and I, too, wondered why it was necessary. I wonder if it wears off or if you are permanently immune.