title: Effect on diphtheria immunity of combined tetanus and diphtheria booster vaccination in adults.
abstract: The effect of a single booster injection of an adult formulation of a combined diphtheria-tetanus vaccine (Td) on diphtheria-specific immunity was evaluated. The booster injection, containing 2 IU diphtheria toxoid per dose, was given as part of the surgical wound management for adults with open soft tissue injuries. Diphtheria antitoxin concentrations were determined in serum samples from 534 patients (199 women and 335 men, aged 18-70 years) using an enzyme immunoassay and a tissue culture toxin neutralization assay. Seroimmunity against diphtheria toxin was classified at three levels: susceptibility, basic protection, and full protection against the toxic manifestations of the disease. Before vaccination, 27.1% of the subjects were susceptible to diphtheria, 26.5% had basic protection, and 46.4% were fully protected. Six weeks (minimum 25 days, maximum 98 days) after a single booster injection, 89.7% of the subjects achieved full protection against diphtheria, and only 3.9% had antitoxin levels below the protective level. The median increase from the prevaccination to postvaccination antitoxin concentration was found to be 14-fold (4.4-47; quartiles Q25 to Q75). The change in antitoxin levels after revaccination was higher in older age groups (P< 0.001), whereas neither sex (P = 0.86) nor the country of previous immunization with a different national immunization schedule (P=0.61) had a significant influence on the revaccination effect. Systemic adverse reactions were rare, and local reactions of clinical significance were reported in only 1.9% of subjects.
authors.affiliation: University Clinic for Trauma Surgery, University of Vienna Medical School, General Hospital, Austria. stefan.marlovits@akh-wien.ac.at
authors.forename: S
authors.initials: S
authors.lastname: Marlovits
authors.forename: R
authors.initials: R
authors.lastname: Stocker
authors.forename: A
authors.initials: A
authors.lastname: Efstratiou
authors.forename: K
authors.initials: K
authors.lastname: Broughton
authors.forename: A
authors.initials: A
authors.lastname: Kaider
authors.forename: V
authors.initials: V
authors.lastname: Vécsei
authors.forename: H
authors.initials: H
authors.lastname: Kollaritsch
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D004166:Diphtheria Antitoxin / Q000097:blood*; D022422:Diphtheria-Tetanus Vaccine / Q000009:adverse effects / Q000276:immunology*; D005260:Female; D006801:Humans; D007117:Immunization, Secondary; D008297:Male; D008875:Middle Aged; D012727:Sex Characteristics
chemical_list: D004166:Diphtheria Antitoxin; D022422:Diphtheria-Tetanus Vaccine