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Covid19 doesn't need to be "eradicated" for things to go back to normal, it just needs to be under control. Also cancer is not caused by a virus and cannot be transmitted from person to person.

Has Smallpox been eradicated? Yes
Has Polio been eradicated? In developed countries, Yes.
Have they found a vaccine for Diptheria? Yes
Have they found a vaccine for Measles? Yes
Have they found a vaccing for Tetanus? Yes
Have they found a vaccine of Tuberculosis? Yes
Have they found a vacine for Encaphalitis? Yes
Have they found a caccine for Rabies? Yes

Many, many dieases have been cured or become treatable.