75% to 90% is not impossible in reasonable countries. Many childhood vaccines are expected to be administered to at least 95% of the children. There are two pr

75% to 90% is not impossible in reasonable countries. Many childhood vaccines are expected to be administered to at least 95% of the children. There are two promising aspects. Vaccination after infection boost antibody levels and is providing very good protection. Infection after vaccination is also boosting antibody levels to similar level and there is hope the it also gives very good protection.