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Tetanus immunity in elderly people

S M Murphy1, D M Hegarty, C S Feighery

  • 1Mercer's Institute for Research on Ageing.

Age and Ageing
|March 1, 1995
PubMed
Summary
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Elderly individuals often lack tetanus immunity, and their immunization history is unreliable for predicting protection. However, older adults can develop protective tetanus antibody levels after primary immunization.

Area of Science:

  • Gerontology
  • Immunology
  • Public Health

Background:

  • Tetanus immunity wanes over time, posing risks to elderly populations.
  • Assessing tetanus immune status in older adults is crucial for public health strategies.

Purpose of the Study:

  • To determine tetanus immunity levels in elderly individuals.
  • To evaluate the accuracy of immunization history in predicting tetanus immunity.
  • To compare tetanus immunization response in elderly versus younger subjects.

Main Methods:

  • Recruited three groups: day-hospital attenders (n=100), long-term-care residents (n=100), and young subjects (n=50).
  • Measured tetanus antitoxin antibody titres.
  • Assessed the predictive value of immunization history.

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Main Results:

  • Protective tetanus antibody titres were found in 20% of day-hospital attenders, 45% of long-term-care residents, and 80% of young subjects.
  • Immunization history showed poor predictive value (50% positive, 76% negative).
  • Older adults exhibited a slower, lower-magnitude response to tetanus immunization, but 97% achieved protective levels after primary immunization.

Conclusions:

  • Elderly populations exhibit suboptimal tetanus immunity.
  • Immunization records are unreliable predictors of tetanus immune status in older adults.
  • Primary tetanus immunization is effective in inducing protective immunity in the elderly.