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[Preventive tetanus immunization and avoidance of side effects of booster immunization].

Prevalence of antibodies against tetanus toxoid (tetanus antitoxin titre) was measured in 5,235 males aged 17-60 years, 3,069 (59%) aged 20-22 years. Taking as criterion a threshold value of 0.1 IU/ml, 5,071 (97%) had adequate tetanus immunity. 1,301 of 4,355 aged 21-30 years (30%) actually had antibody concentrations above 6.3 IU/ml. Booster injections are especially contraindicated in this latter group because of the danger of side effects with further toxoid doses. Thoughtless routine booster immunization should therefore be avoided.