title: [Haemophilus influenzae nasopharyngeal colonization in children].
abstract: OBJECTIVE
  to determine frequency, serotypes, biotypes and susceptibility to eight antibiotics in Haemophilus influenzae nasopharyngeal isolates in children under five years old from Mexico City.
  
  
  METHODS
  cross-sectional survey including children two months to five years old. A nasopharyngeal sample was taken. Haemophilus influenzae identification, serotyping, biotyping and antimicrobial susceptibility were performed.
  
  
  RESULTS
  a sample of 573 children were included. In 88/573 (15.3 %) H. influenzae was isolated, corresponding in 7/573 (1.2 %) to Hib, 3/573 (0.5 %) to Hi a, c, d, f and 78/573 (13.6 %) to Nontypable Hi. Among Hib carriers, 6 had received only one or two doses of specific vaccine. Biotype VIII (76.1 %) was the predominant. All isolates were susceptible to the antibiotics, but one Hib strain was resistant to erithromycin.
  
  
  CONCLUSIONS
  nontypable Haemophilus influenzae was predominant. Colonization by Hib in children under 5 years old was low (1.2 %), occurring in children with an incomplete vaccination schedule.
authors.affiliation: Departamento de Infectología, Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Distrito Federal, México. fortino.solorzano@imss.gob.mx
authors.forename: Fortino
authors.initials: F
authors.lastname: Solórzano-Santos
authors.forename: Ma Guadalupe
authors.initials: MG
authors.lastname: Miranda-Novales
authors.forename: Blanca
authors.initials: B
authors.lastname: Leaños-Miranda
authors.forename: Laura Alicia
authors.initials: LA
authors.lastname: Ortiz-Ocampo
authors.forename: Gabriela
authors.initials: G
authors.lastname: Echaniz-Avilés
authors.forename: Gerardo
authors.initials: G
authors.lastname: Palacios-Saucedo
authors.forename: Hector
authors.initials: H
authors.lastname: Guiscafré-Gallardo
mesh_terms: D002353:Carrier State; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D006193:Haemophilus influenzae / Q000145:classification / Q000187:drug effects / Q000302:isolation & purification*; D006801:Humans; D007223:Infant; D008297:Male; D008800:Mexico; D008826:Microbial Sensitivity Tests; D009305:Nasopharynx / Q000382:microbiology*; D014505:Urban Population