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[Contact investigation according to concentric circles in a case of laryngeal tuberculosis]
Pere Godoy1, Joan Torres, José Otal
1Unidad de Vigilancia Epidemiológica de Lleida, Agencia de Salud Pública de Cataluña, Lleida, España. pere.godoy@gencat.cat
Objective:
To describe the census and contact investigation in a case of laryngeal tuberculosis.
Methods:
Based on a patient with laryngeal tuberculosis and through interviews and ocular inspection, we established three circles of contacts. The tuberculin test was performed (positive ≥5 mm). Persons testing positive were invited to undergo a chest x-ray. The association of the infection was calculated with the odds ratio. The exposure-response relationship was determined with the linear trend χ2 test.
Results:
The overall prevalence of infection was 39.9% (67/168). The prevalence among coworkers was 60.0% (24/40), that among frequenters of the town bar was 43.3% (13/30) and the conversions rate was 12.9%. There was a relationship with the degree of exposure (p <0.0001).
Conclusions:
Laryngeal tuberculosis involved high transmission to coworkers and frequenters of the town bar. In-depth studies through concentric circles and good communication with exposed individuals should be carried out.
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