Prevalence and factors associated with latent tuberculosis infection in an indigenous population in the Brazilian Amazon
Rev. Soc. Bras. Med. Trop
; Rev. Soc. Bras. Med. Trop;49(4): 456-464, July-Aug. 2016. tab, graf
Article
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| ID: lil-792802
Bibliothèque responsable:
BR1.1
ABSTRACT
Abstract INTRODUCTION Recent studies have shown a high incidence and prevalence of latent tuberculosis infection (LTBI) in indigenous populations around the World. We aimed to estimate the prevalence and annual risk of infection (ARI) as well as to identify factors associated with LTBI in an indigenous population from the Brazilian Amazon. METHODS We conducted a cross-sectional study in 2011. We performed tuberculin skin tests (TSTs), smears and cultures of sputum samples, and chest radiographs for individuals who reported cough for two or more weeks. Associations between LTBI (TST ≥5mm) and socio-demographic, clinical, and epidemiological characteristics were investigated using Poisson regression with robust variance. Prevalence ratio (PR) was used as the measure of association. RESULTS We examined 263 individuals. The prevalence of LTBI was 40.3%, and the ARI was 2.4%. Age ≥15 years [PR=5.5; 95% confidence interval (CI) 3.5-8.6], contact with tuberculosis (TB) patients (PR=3.8; 95% CI 1.2-11.9), previous TB history (PR=1.4; 95% CI 1.2-1.7), and presence of Bacillus Calmette-Guérin (BCG) scar (PR=1.9, 95% CI 1.2-2.9) were associated with LTBI. CONCLUSIONS Although some adults may have been infected years prior, the high prevalence of infection and its strong association with age ≥15 years, history of TB, and recent contact with TB patients suggest that the TB transmission risk is high in the study area.
Mots clés
Texte intégral:
1
Indice:
LILACS
Sujet Principal:
Indien Amérique Sud
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Tuberculose latente
Type d'étude:
Diagnostic_studies
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Etiology_studies
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Observational_studies
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Prevalence_studies
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Prognostic_studies
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Risk_factors_studies
Limites du sujet:
Adolescent
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Adult
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Female
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Humans
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Male
Pays comme sujet:
America do sul
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Brasil
langue:
En
Texte intégral:
Rev. Soc. Bras. Med. Trop
Thème du journal:
MEDICINA TROPICAL
Année:
2016
Type:
Article