The Use of Tetanus Toxoid to Elucidate the Delayed-Type Hypersensitivity Response in an Older, Immunized Population

Tuberculin reactivity decreases with age despite epidemiologic evidence that the elderly are more likely to have been infected. Whether this phenomenon is due to lack of antigenic stimulus or host inability to mount a delayed type hypersensitivity (DTH) response is unclear. In order to determine if...

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