"Of the 3 strains of wild poliovirus (type 1, type 2 and type 3), wild poliovirus type 2 was eradicated in 1999 and no case of wild poliovirus type 3 has been found since the last reported case in Nigeria in November 2012. Both strains have officially been certified as globally eradicated. As at 2020, wild poliovirus type 1 affects two countries: Pakistan and Afghanistan."
Polio is a rather big thing. The plague isn't. Much less monkeypox. Monkeypox, ebola and other African viruses and whatnot are just part of Africa. Everything in Africa wants to kill you and can. It takes a special kind of toughness to survive there.