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COPD and the Risk of Tuberculosis - A Population-Based Cohort Study

Author

Listed:
  • Malin Inghammar
  • Anders Ekbom
  • Gunnar Engström
  • Bengt Ljungberg
  • Victoria Romanus
  • Claes-Göran Löfdahl
  • Arne Egesten

Abstract

Background: Both chronic obstructive pulmonary disease (COPD) and tuberculosis (TB) primarily affect the lungs and are major causes of morbidity and mortality worldwide. COPD and TB have common risk factors such as smoking, low socioeconomic status and dysregulation of host defence functions. COPD is a prevalent co-morbid condition, especially in elderly with TB but in contrast to other diseases known to increase the risk of TB, relatively little is known about the specific relationship and impact from COPD on TB-incidence and mortality. Methods and Findings: All individuals ≥40 years of age, discharged with a diagnosis of COPD from Swedish hospitals 1987–2003 were identified in the Swedish Inpatient Register (n = 115,867). Records were linked to the Swedish Tuberculosis Register 1989–2007 and the relative risk of active TB in patients with COPD compared to control subjects randomly selected from the general population (matched for sex, year of birth and county of residence) was estimated using Cox regression. The analyses were stratified by year of birth, sex and county of residence and adjusted for immigration status, socioeconomic status (SES) and inpatient co-morbidities previously known to increase the risk of TB. COPD patients had a three-fold increased hazard ratio (HR) of developing active TB (HR 3.0 (95% confidence interval 2.4 to 4.0)) that was mainly dependent on an increased risk of pulmonary TB. In addition, logistic regression estimates showed that COPD patients who developed active TB had a two-fold increased risk of death from all causes within first year after the TB diagnosis compared to the general population control subjects with TB (OR 2.2, 95% confidence interval 1.2 to 4.1). Conclusions: This population-based study comprised of a large number of COPD patients shows that these patients have an increased risk of developing active TB compared to the general population. The results raise concerns that the increasing global burden of COPD will increase the incidence of active TB. The underlying contributory factors need to be disentangled in further studies.

Suggested Citation

  • Malin Inghammar & Anders Ekbom & Gunnar Engström & Bengt Ljungberg & Victoria Romanus & Claes-Göran Löfdahl & Arne Egesten, 2010. "COPD and the Risk of Tuberculosis - A Population-Based Cohort Study," PLOS ONE, Public Library of Science, vol. 5(4), pages 1-7, April.
    • Handle: RePEc:plo:pone00:0010138
    DOI: 10.1371/journal.pone.0010138
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    References listed on IDEAS

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    1. Lönnroth, Knut & Jaramillo, Ernesto & Williams, Brian G. & Dye, Christopher & Raviglione, Mario, 2009. "Drivers of tuberculosis epidemics: The role of risk factors and social determinants," Social Science & Medicine, Elsevier, vol. 68(12), pages 2240-2246, June.
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