Lagging Immunity of Our Children

Abstract
The recovery of Type 2 poliovirus from an infant and two close contacts, reported in this week's correspondence by Lamb and Feldman (page 1435), highlights a growing problem in the United States. Despite the availability of effective vaccines, and the remarkable success that has been achieved in virtually eliminating paralytic poliomyelitis from large geographic areas by their use, there are warning signals of potential danger ahead. This relates to the evidence that although circulation of wild polioviruses has been greatly reduced, these agents are still lurking about, and if a sizable number of susceptible persons were allowed to build up, . . .

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