Am J Perinatol 2001; 18(7): 379-386
DOI: 10.1055/s-2001-18695
ORIGINAL ARTICLES

Copyright © 2001 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel.: +1(212) 584-4693

Response to Hepatitis B Vaccine in Preterm Infants: Four-Dose Schedule

Angel Ballesteros-Trujillo1 , Arturo Vargas-Origel2 , Teresa Alvarez-Muñoz3 , Carlos Aldana-Valenzuela1
  • 1Department of Neonatology, Hospital de Gineco-Pediatría No. 48, Instituto Mexicano del Seguro Social, León, Gto., México
  • 2Research Unit in Clinical Epidemiology, Hospital de Gineco-Pediatría No. 48, Instituto Mexicano del Seguro Social, León, Gto., México
  • 3Research Unit in Infectious and Parasitic Diseases, Hospital de Pediatría, Centro México Nacional Siglo XXI, Instituto Mexicano del Seguro Social, México, D.F
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Publikationsdatum:
03. Dezember 2001 (online)

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ABSTRACT

The objective of this study is to test a four-dose Hepatitis B vaccine schedule in premature infants (PI) and assess the immunogenicity of the vaccine with this schedule. We studied 29 PI who received the vaccine against Hepatitis B at birth, 1, 5, and 9 months of age. Antibodies against surface antigen (Anti-HBs) were measured before the third and fourth doses and 12 weeks after the fourth dose. Levels higher than 10 mIU/mL were considered protective, whereas more than 100 mIU/mL was an excellent response. Twenty-nine PI were studied. The average weight at the time of the initial dose was 1398 g, gestational age of 32.5 weeks, and a postnatal age of 9 days. Since the initial measurement, protective levels were achieved in all patients. The response was excellent in 24.1, 75.9, and 89.7%, after the second, third, and fourth doses, respectively. No correlation was found between the type of response and the infants' weight or the postnatal age. The Anti-HBs geometrical levels were 51.9, 133, and 133 mIU/mL after the second, third, and fourth doses, respectively. The favorable results obtained might be due to: the four-dose schedule itself, the dose we used (10 μg), the time interval between the doses, and even a race factor. Our schedule seems to be useful for PI infants and probably is no longer necessary to delay the vaccination, although this should be confirmed by further studies.

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