Unlikely phenomenon becomes more glaring as world comes closer to wiping out naturally concurring disease, but now faces more cases caused by oral immunization

Health Ministry says nine cases diagnosed so far in Jerusalem area; drive to expand nationwide to children up to 6, with those aged 7-17 eligible after Passover

Unvaccinated 4-year-old in Jerusalem tests positive for mutated version of disease; parents urged to get their children's inoculations up-to-date