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[–] JastheMace ago 

It's not eliminated. A virus by it's nature becomes less virulant over time. If it's killing it's host, it's an unsucessful virus. Pretty much all of the diseases were wiped out prior to vaccines. Look at the deaths per 100k, 100 year long charts. Measles crashed down to under 1% 24 years before the measles vaccine was introduced. Scarlet Fever never had a vaccine and it crashed in the same time frame as all the others. Better sanatation, focus on proper nutrition and better quarantine practices is what changed.