Vaccines are a firmware update and this is our Service Pack 1https://twitter.com/owasow/status/1437053803740626948 …
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there are still polio cases here and there among the unvaccinated https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5441a6.htm …
I think you missed a joke here :-)
I fear your sarcasm will be missed!
It's always missed.
Perhaps they are now very rare precisely because of the vaccines?
Because they come back if you don't do it.
Totally missed the sarcasm until saw the comments. 
Adding '/s' could help, but why would anyone care about others? /s
likely because they still exist in the world and if you're not vaccinated eventually a given pathogen will infect humans again - polio is a good example.
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