Tetanus and diphtheria immune status of patients in a family practice.

Sera obtained randomly from 37 patients seen at a family practice center were evaluated for protective antibodies against tetanus and diphtheria using in vivo toxin neutralization methods. The patients' ages ranged from 1 to 99 years. Seventy-four percent and 83 percent of patients were found to have protective antitoxin titers against tetanus and diphtheria, respectively.