When I was a boy, I had something-or-other that made me at very high risk for complications if I took the Smallpox vaccine. When we traveled to Africa in the 19

When I was a boy, I had something-or-other that made me at very high risk for complications if I took the Smallpox vaccine. When we traveled to Africa in the 1960s, my mother had to take special documentation proving that I culd not take the vaccine, and that I had been tested for Smallpox. My understanding is that it was regulations prohibiting travel between countries by unvaccinated persons that helped eradicate Smallpox, and my paperwork is now a quaint story about a bygone era. Or it would be, if I didn’t remember the whole thing afresh every time anti-vaxxers demand the “right” to send their unvaccinated children into public schools.