title: [Prevalence of tuberculosis infection in students in the city of Tijuana, Mexico].
abstract: OBJECTIVE
  To determine the prevalence of tuberculosis infection in school children from Tijuana, Mexico.
  
  
  METHODS
  A study sample was randomly chosen from the municipal school registry and 1,131 elementary and high school children were included. All received one doses of PPD 5TU (Mantoux). Subjects with induration > or = 10 mm were considered positive reactors.
  
  
  RESULTS
  The overall prevalence of positive reactors was 57%. The proportion of positive reactors was significantly higher among BCG-immunized subjects than in non-immunized individuals (59.7 vs 45.6%; p < 0.001). Correlation was not significant between age of immunization with BCG and diameter of induration.
  
  
  CONCLUSIONS
  The prevalence of tuberculosis infection in Tijuana is extremely high; this fact has important implications in the control of tuberculosis in this region.
authors.affiliation: Hospital General de Tijuana, Facultad de Medicina-Tijuana, Universidad Autónoma de Baja California, México.
authors.forename: R
authors.initials: R
authors.lastname: Laniado-Laborín
authors.forename: N
authors.initials: N
authors.lastname: Cabrales-Vargas
authors.forename: G
authors.initials: G
authors.lastname: López-Espinoza
authors.forename: J L
authors.initials: JL
authors.lastname: Lepe-Zúñiga
authors.forename: S
authors.initials: S
authors.lastname: Quiñonez-Moreno
authors.forename: C E
authors.initials: CE
authors.lastname: Rico-Vargas
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico / Q000453:epidemiology; D015995:Prevalence; D017678:Sex Distribution; D013334:Students / Q000706:statistics & numerical data*; D014374:Tuberculin Test / Q000706:statistics & numerical data; D014397:Tuberculosis, Pulmonary / Q000453:epidemiology* / Q000276:immunology
vernacular_title: Prevalencia de infección tuberculosa en escolares de la ciudad de Tijuana, México.