title: Interchangeability of Hepatitis A boosters, Avaxim and Vaqta, in healthy adults following a primary dose of the combined typhoid/Hepatitis A vaccine Viatim.
abstract: This study investigated the suitability of Avaxim and Vaqta as Hepatitis A booster vaccines 6 months after priming with the combined Hepatitis A/typhoid vaccine, Viatim. One hundred and twenty adults were randomly assigned to one of the three groups. Group A (reference group) received Avaxim then Avaxim (n = 40), Group B received Viatim then Avaxim (n = 41) and Group C received Viatim then Vaqta (n = 39). One month after booster vaccination, anti-Hepatitis A virus (anti-HAV) antibodies geometric mean concentrations (GMC) of subjects primed with Viatim were non-inferior to the group primed and boosted with the monovalent Hepatitis A vaccine Avaxim. Anti-Salmonella typhi capsular polysaccharide virulence antigen (anti-Vi) GMCs in groups primed with Viatim were protective and all vaccines were well-tolerated. Therefore, Viatim may be used as a primary HAV vaccine with either Avaxim or Vaqta as Hepatitis A boosters and it will provide the same protection as two doses of Avaxim.
authors.affiliation: Karolinska University Hospital, Huddinge, Stockholm, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Ekwall
authors.forename: A
authors.initials: A
authors.lastname: Ulgemo
authors.forename: M
authors.initials: M
authors.lastname: Watson
authors.forename: F
authors.initials: F
authors.lastname: Boisnard
authors.forename: S
authors.initials: S
authors.lastname: Thomas
authors.forename: F
authors.initials: F
authors.lastname: Goullet
mesh_terms: D000328:Adult; D005260:Female; D022362:Hepatitis A Vaccines / Q000008:administration & dosage* / Q000276:immunology; D006801:Humans; D007117:Immunization, Secondary; D008297:Male; D008875:Middle Aged; D014436:Typhoid-Paratyphoid Vaccines / Q000008:administration & dosage* / Q000276:immunology; D017778:Vaccines, Combined
chemical_list: D022362:Hepatitis A Vaccines; D014436:Typhoid-Paratyphoid Vaccines; D017778:Vaccines, Combined