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Related Experiment Videos

Tuberculin sensitivity in tuberculosis.

J K Onwubalili1

  • 1Division of Communicable Diseases, MRC Clinical Research Centre, Harrow, Middlesex, U.K.

African Journal of Medicine and Medical Sciences
|September 1, 1987
PubMed
Summary

Tuberculin skin test anergy in tuberculosis patients is linked to malnutrition and higher bacillary load. Early skin reactions may aid in diagnosing active tuberculosis, especially when combined with nutritional improvements during treatment.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Public Health

Background:

  • Tuberculosis diagnosis often relies on tuberculin skin tests (TST), but anergy can complicate interpretation.
  • Understanding factors influencing TST reactivity, like malnutrition and disease severity, is crucial for accurate diagnosis and management.

Purpose of the Study:

  • To investigate the relationship between TST reactivity, nutritional status, bacillary load, and treatment response in tuberculosis patients.
  • To evaluate the diagnostic utility of early and delayed TST reactions, including potential booster effects.

Main Methods:

  • Assessed TST induration (1 TU and 10 TU PPD) in untreated tuberculosis patients and healthy controls.
  • Correlated TST results with radiological extent of disease, bacillary load, nutritional status, and sputum sterilization times.
  • Monitored early (6-8h) and delayed (48-72h) skin reactions and the effect of repeat testing.

Main Results:

  • A significant proportion of untreated tuberculosis patients exhibited anergy to TST.
  • Non-reactors showed poorer nutritional status, higher bacillary excretion, and prolonged sputum sterilization.
  • Early TST reactions were significantly more frequent in patients than controls, suggesting potential diagnostic value.

Conclusions:

  • Antigen overload in tuberculosis may contribute to both skin anergy and undernutrition.
  • Early tuberculin skin reactions offer a specific, though not highly sensitive, method for aiding tuberculosis diagnosis.
  • Nutritional status and TST reactivity improve with effective chemotherapy.

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