[Immunity against tetanus in patients with chronic diseases].

A study of the blood serum in indirect hemagglutination reaction in 435 patients with ulcer and neoplastic diseases of the gastrointestinal tract and, in particular, of the liver and biliary tract revealed lower concentrations of tetanus antitoxin than in healthy persons of corresponding age. The proportion of protected against tetanus in individual types of pathology decreased to 58.0 +/- 7%-48.0 +/- 7.1% indicating the necessity of correcting immunity in this category of patients.