PEDIATRICS Vol. 99 No. 4 April 1997, pp. 534-536
Received Jan 2, 1996; accepted May 28, 1996.
,
From the * Children's Hospital of Philadelphia, Philadelphia,
Pennsylvania;
Lankenau Hospital, Wynnewood, Pennsylvania; and
§ Merck Research Laboratories, West Point, Pennsylvania.
Objective. To determine the immunogenicity of hepatitis B vaccine in preterm infants when the first dose of vaccine is delayed until hospital discharge.
Methods. One hundred two preterm infants (23 to 36 weeks' gestational age) born to hepatitis B surface antigen-negative mothers were enrolled. Immunization was initiated just before hospital discharge with subsequent doses 1 and 6 months later. Serum specimens were obtained before the administration of each vaccine dose and 3 months after the last dose and were tested for antibody to hepatitis B surface antigen (antiHBs).
Results. Eighty-seven infants (85%) completed the
study. Ninety percent (n = 78) of infants who completed the study
seroconverted (antiHBs
10 mIU/mL); 10% (n = 9) remained
seronegative at study completion. The geometric mean antibody titer to
hepatitis B surface antigen for infants who seroconverted was 200 mIU/mL. Nonresponders (NR) differed from responders (R) in birth weight
(NR = 2090 g, R = 1560 g) gestational age (NR = 33 weeks, R = 31 weeks), and weight gain before vaccine
initiation (NR = 244 g, R = 633 g). There were no
differences in weight or age at vaccine initiation, Apgar scores,
interval between vaccine doses, or bacterial infections, steroid use,
or transfusions before vaccine initiation.
Conclusions. Ninety percent of preterm infants responded to hepatitis B vaccine when the first dose of vaccine was delayed until hospital discharge. Nonresponders were more likely to be preterm infants of higher birth weight and higher gestational age, and to have gained less weight before vaccine initiation.
Key words: hepatitis B vaccine, immunogenicity, preterm infants.
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