Background Because a strong association was observed between pulmonary tuberculosis (TB) and the use of public transport, increasing with duration of journey, a study was carried out to assess infection by Mycobacterium tuberculosis and working conditions among workers in this sector.
Methods A cross-sectional study was conducted between June and September 2008. A total of 104 workers from two public transport minibus (‘combi’) cooperatives covering marginal areas of the Ate-Vitarte district in Lima were interviewed. Demographic and occupational details were collected as well as prior family and personal history of TB and BCG vaccination. The tuberculin skin test (TST) was administered to each study subject and an induration of ≥10 mm was considered positive. Statistical analysis was based on logistic models, ORs and their 95% CIs.
Results TST results were obtained for 70.2% (n=73), of whom 76.6% (n=56) were positive. Positivity was significantly associated with those who had worked for more than 2 years (crude OR 11.04; 95% CI 3.17 to 38.43) and more than 60 h/week (crude OR 9.8; 95% CI 2.85 to 33.72). These associations remained significant in a multivariate model as well.
Conclusion The association observed between years of working and weekly work burden among minibus workers suggests an occupational risk in service jobs in low-income countries with high TB prevalence. Consequently, other types of users are at increased risk for TB infection, with a causal relationship between effect and duration of exposure.
- Occupational health practice
- tuberculosis and transport
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OJH-C, EC, HJS-P, AN and MM-M are members of GRAAL (Grups de Recerca d'Amèrica i Àfrica Llatines; http://www.graal.uab.cat/about.html).
Funding This work was funded partly by the Fundación Autónoma Solidaria (FAS-UAB) and partly by the Spanish Lung and Respiratory Diseases Society (SEPAR-Solidaria).
Competing interests None.
Ethics approval This study was conducted with the approval of the Ethics Committee of Health Directorate IV (East Lima), Ministry of Health.
Provenance and peer review Not commissioned; externally peer reviewed.
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