title: [Pertussis: a case study by PCR and culture].
abstract: OBJECTIVE
  To describe an epidemiological study of one case of pertusis.
  
  
  METHODS
  a five-year old boy was diagnosed with pneumonia and he had incomplete DPT vaccination scheme; pertusis was diagnosed by using the PCR technique and culture. An epidemiological study with family contacts was carried out, in which 20 samples for both tests were obtained. These were taken twice.
  
  
  RESULTS
  The average age of the family members was 26.5 years, 50 % were women, 62 % did not have social security and 30 % had three doses of DPT. 35 % were positive to PCR and, 20 % out of these had positive cultures.
  
  
  CONCLUSIONS
  In children smaller than five years suffering from pneumonia, is relevant to ascertain about DPT vaccination status and to consider the possibility of carrying out an epidemiological study with the family.-
authors.affiliation: Unidad de Investigación Epidemiológica y un Servicios de Salud, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico. guillermina.romero@imss.gob.mx
authors.forename: Guillermina
authors.initials: G
authors.lastname: Romero-Quechol
authors.forename: Patricia
authors.initials: P
authors.lastname: Tomé-Sandoval
authors.forename: Laura Del Pilar
authors.initials: Ldel P
authors.lastname: Torres-Arreola
authors.forename: Héctor
authors.initials: H
authors.lastname: Guiscafré-Gallardo
authors.forename: Blanca
authors.initials: B
authors.lastname: Leaños-Miranda
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002675:Child, Preschool; D005192:Family Health; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014917:Whooping Cough / Q000175:diagnosis* / Q000453:epidemiology*