SHOULD ADULT TETANUS IMMUNIZATION BE GIVEN AS A SINGLE VACCINATION AT AGE 65

Objective: To compare three vaccination strategies for the prevention of adult tetanus. Each strategy includes childhood primary immunization and wound prophylaxis, and one of the following: 1) the currently recommended booster every ten years; 2) a single booster at 6 5 years of age; or 3) no intervention after age 6 except for wound prophylaxis. Methods: Cost-effectiveness analysis was used to compare the three different strategies. A Markov model, cycled annually from age 5 through age 85, was applied to each strategy to predict the incidence and costs of tetanus for the U.S. adult population. Results: The three strategies have very similar effects on life expectancy but different costs. Expressed incremental to no intervention after childhood primary immunization, the decennial booster strategy is least cost-effective, with a discounted incremental cost-effectiveness ratio of $143,138 per year of life saved compared with $4,527 for the single-booster strategy. Sensitivity analysis demonstrates that the decennial strategy is more effective but more costly over a wide range of model assumptions. Conclusions: The current policy of recommending tetanus booster vaccinations every ten years is effective but much more costly than a more easily implemented policy that also provides considerable protection against tetanus. The authors recommend forsaking decennial boosters in favor of a policy of including a single booster at age 65 along with other recommended health maintenance maneuvers reserved for that age.