title: Serotypes of 286 group B streptococci isolated from asymptomatic carriers and invasive disease cases in Mexico.
abstract: BACKGROUND
  Group B Streptococcus (GBS) remains as a leading cause of neonatal sepsis and meningitis in developed countries, where type III is the most common serotype. Although GBS is considered an uncommon cause of perinatal pathology in Mexico, a vaginal colonization rate of 14% in pregnant women and a neonatal infection rate of 1/1500 live births have been reported. The aim of this study was to determine the serotype distribution in a collection of 286 GBS strains isolated in Mexico from asymptomatic carriers and in adult and neonatal invasive disease cases.
  
  
  METHODS
  The collection included GBS strains isolated between January 1988 and April 1998 at the Instituto Nacional de Perinatologia and Hospital de Pediatria in Mexico City. GBS and serotype were confirmed by latex agglutination.
  
  
  RESULTS
  Most strains were isolated from asymptomatic carriers (66%). 30% were invasive isolates, and 10% of them were from neonates. 48.6% were type I, 32.9% type III, 14% type II, and 4% were non-typeable.
  
  
  CONCLUSIONS
  Serotype I is predominant in Mexico but participation of serotype III is increasing, and a decrease of non-typeable isolates was detected.
authors.affiliation: Departamento de Infectología y Unidad de Investigación en Enfermedades Infecciosas y Parasitarias, Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social. palsaugc@att.net.mx
authors.forename: Gerardo C
authors.initials: GC
authors.lastname: Palacios
authors.forename: María N
authors.initials: MN
authors.lastname: González
authors.forename: Magdalena
authors.initials: M
authors.lastname: Beltrán
authors.forename: José L
authors.initials: JL
authors.lastname: Arredondo
authors.forename: Javier
authors.initials: J
authors.lastname: Torres
authors.forename: Fortino
authors.initials: F
authors.lastname: Solórzano
mesh_terms: D000328:Adult; D002353:Carrier State / Q000382:microbiology*; D005260:Female; D006776:Hospitals, Pediatric / Q000706:statistics & numerical data; D006801:Humans; D007231:Infant, Newborn; D007841:Latex Fixation Tests; D008297:Male; D008800:Mexico / Q000453:epidemiology; D011247:Pregnancy; D012703:Serotyping; D013290:Streptococcal Infections / Q000453:epidemiology* / Q000382:microbiology / Q000635:transmission; D013292:Streptococcus agalactiae / Q000145:classification* / Q000302:isolation & purification / Q000472:pathogenicity; D014774:Virulence