In the News story “Global polio eradication effort struggles with the end game” (22 September, p. 1271), J. Cohen interviews Tom Frieden, who deplores the slow eradication of wild polio virus and recommends the use of further attenuated oral polio vaccine strains to reduce the numbers of vaccine-caused paralytic polio. Although vaccine campaigns that use the improved vaccine virus would prevent polio caused by wild virus, they would still cause cases of polio. This plan is unacceptable when a safer, more effective vaccine protocol exists.
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