title: A randomized trial of alternative two- and three-dose hepatitis B vaccination regimens in adolescents: antibody responses, safety, and immunologic memory.
abstract: OBJECTIVE
  Hoping to increase hepatitis B (HB) vaccination of adolescents, we did the following: 1) studied if modified regimens of the recombinant HB vaccine, Recombivax HB (2 or 3 doses of 5 or 10 microg given over 4 or 6 months), induce protective anti-hepatitis B surface antibody [anti-HBsAb] levels (>/=10 mIU/mL) comparable to the recommended regimen (5 microg at 0 and 1, and 6 months); 2) measured early antibody response after a single dose; and 3) assessed immunologic memory after 2- and 3-dose regimens.
  
  
  METHODS
  One thousand twenty-six adolescents were randomized to 1 of 5 treatment groups (10 microg at 0 and 4 or 0 and 6 months; 5 microg at 0 and 6 or 0, 2, and 4 or 0, 1, and 6 months) in an open trial. Anti-HBsAb was measured in all participants just before and 1 month after the last dose, and at several other times in a subset of vaccinees. Anti-HBsAb response to a booster dose 2 years later was examined to assess immunologic memory in participants vaccinated with 5 microg at 0 and 6 or 0, 1, and 6 months.
  
  
  RESULTS
  All regimens induced >/=10 mIU/mL of anti-HBs in >/=95% of vaccinees. Geometric mean titers ranged from 674.8 to 3049.4 mIU/mL. Geometric mean titers were higher with regimens using the following: 1) 10 versus 5 microg; 2) 3 versus 2 doses; and 3) vaccination intervals of 6 versus 4 months. After 6 months, 63.8% of vaccinees given one 10-microg dose had >/=10 mIU/mL of anti-HBsAb versus 41.6% after one 5-microg dose. Participants vaccinated with either two or three 5-microg doses retained robust immunologic memory.
  
  
  CONCLUSIONS
  . The results of this study show that a 2-dose regimen of Recombivax HB is as immunogenic and induces immunologic memory as effectively as the recommended 3-dose regimen. A regimen of two 10-microg doses may be of significant benefit for vaccinees who are poorly compliant or deviate from the intended vaccination schedule.
authors.affiliation: Department of Medicine, Louisiana State University Health Science Center, Baton Rouge, Louisiana 70805, USA. wcassi@lsuhsc.edu.
authors.forename: W M
authors.initials: WM
authors.lastname: Cassidy
authors.forename: B
authors.initials: B
authors.lastname: Watson
authors.forename: V A
authors.initials: VA
authors.lastname: Ioli
authors.forename: K
authors.initials: K
authors.lastname: Williams
authors.forename: S
authors.initials: S
authors.lastname: Bird
authors.forename: D J
authors.initials: DJ
authors.lastname: West
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000917:Antibody Formation; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D006509:Hepatitis B / Q000276:immunology / Q000517:prevention & control; D017325:Hepatitis B Vaccines / Q000008:administration & dosage* / Q000276:immunology*; D006801:Humans; D007115:Immunization Schedule; D007156:Immunologic Memory; D008297:Male; D014611:Vaccination / Q000592:standards; D014614:Vaccines, Synthetic / Q000008:administration & dosage* / Q000276:immunology*
chemical_list: D017325:Hepatitis B Vaccines; C075655:Recombivax HB; D014614:Vaccines, Synthetic