An error appeared in the article by Reisinger et al, titled “A Combination Measles, Mumps, Rubella, and Varicella Vaccine (ProQuad) Given to 4- to 6-Year-Old Healthy Children Vaccinated Previously with M-M-RII and Varivax” that was published in the February 2006 issue of Pediatrics (doi:10.1542/peds.2005-0092). On page 269, the third paragraph under the subheading Immunogenicity states: “Seropositivity rates for recipients of ProQuad (group 1) at the prevaccination and postvaccination time points are shown in Table 4.” They are not shown there. Seropositivity rates from prevaccination to postvaccination with ProQuad increased from 97.8% to 100% for measles, 96.2% to 99.5% for mumps, and 98.1% to 100% for rubella.

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