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  • Title: Impact of revaccinating children who initially received measles vaccine before 10 months of age.
    Author: Stetler HC, Orenstein WA, Bernier RH, Herrmann KL, Sirotkin B, Hopfensperger D, Schuh R, Albrecht P, Lievens AW, Brunell PA.
    Journal: Pediatrics; 1986 Apr; 77(4):471-6. PubMed ID: 3960615.
    Abstract:
    Two hundred fifty-four infants who had received measles vaccine at less than 10 months of age were revaccinated at greater than or equal to 15 months of age, and their immune responses were compared with 129 control infants who received their first doses of measles vaccine at greater than or equal to 15 months of age. Sera were collected at the time of revaccination (study infants) or primary vaccination (control infants), 3 weeks, and 8 months later and tested for antibody by hemagglutination inhibition (HI), enzyme-linked immunosorbent assay (ELISA), and cytopathic effect neutralization (CPEN). Of the 121 study infants who were initially HI negative, 116 (95.9%) made HI antibody 3 weeks postrevaccination compared with 126 (99.2%) of 127 control infants (P = 0.19). Of the 63 study infants with no initial detectable antibody by any of the three tests, 14 (22.2%) had a measles-specific IgM response 3 weeks postrevaccination compared with 37 of 50 (74.0%) randomly chosen control infants. By 8 months after revaccination, the 121 initially HI-negative study infants were significantly less likely to have detectable HI antibodies than control infants (52.1% v 97.6%) (P less than .001). However, 96.7% of these 121 study infants had detectable neutralizing antibody 8 months postrevaccination, an antibody thought to correlate best with protection. This study confirms the altered immune response to revaccination in infants first vaccinated prior to 10 months of age; however, the data suggest that most of these infants were successfully primed and are probably protected after revaccination.
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