Corrections and Clarifications

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Science  28 May 2004:
Vol. 304, Issue 5675, pp. 1247
DOI: 10.1126/science.304.5675.1247b

News Focus: “The exit strategy” by L. Roberts (26 March, p. 1969). The story incorrectly states that the risk of vaccine-associated poliomyelitis (VAP) from the oral polio vacccine is about 2 to 4 cases per million infants immunized. The correct estimate of the overall population risk is 2 to 4 cases per million births annually. The United States, for example, has a birth cohort of approximately 4 million, so experts expect to see 8 to 16 cases of VAP per year.

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