title: [Contact investigation according to concentric circles in a case of laryngeal tuberculosis].
abstract: 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.
authors.affiliation: Unidad de Vigilancia Epidemiológica de Lleida, Agencia de Salud Pública de Cataluña, Lleida, España. pere.godoy@gencat.cat
authors.forename: Pere
authors.initials: P
authors.lastname: Godoy
authors.forename: Joan
authors.initials: J
authors.lastname: Torres
authors.forename: José
authors.initials: J
authors.lastname: Otal
authors.forename: Anna
authors.initials: A
authors.lastname: Gort
authors.forename: Pilar
authors.initials: P
authors.lastname: Bach
authors.forename: Miquel
authors.initials: M
authors.lastname: Falguera
mesh_terms: D000293:Adolescent; D000328:Adult; D001500:BCG Vaccine; D016358:Contact Tracing / Q000379:methods*; D005260:Female; D033062:Friends; D051639:Gardening; D006801:Humans; D008297:Male; D008875:Middle Aged; D016273:Occupational Exposure; D015995:Prevalence; D011859:Radiography; D012147:Restaurants; D014374:Tuberculin Test; D014376:Tuberculosis / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000635:transmission*; D014387:Tuberculosis, Laryngeal / Q000175:diagnosis; D014397:Tuberculosis, Pulmonary / Q000175:diagnosis; D014611:Vaccination / Q000706:statistics & numerical data; D055815:Young Adult
chemical_list: D001500:BCG Vaccine