title: [Carrier state of groups A, B, C, and D beta-hemolytic streptococci].
abstract: BACKGROUND
  Streptococci group A is the most frequently isolated pathogen in the cases of acute pharyngotonsilitis in school-aged children. Hemolytic streptococci B, which are not of group A, have recently been described as a cause of pharyngotonsilitis. A study was carried out in school children in primary school with the aim of knowing the frequency of the state of pharyngeal carriers of streptococci in groups A, B, C and G.
  
  
  METHODS
  A total of 347 children with ages ranging from 4 to 14 years of age were included in the study in which a pharyngeal exudate was obtained to investigate the presence of hemolytic streptococci B.
  
  
  RESULTS
  The prevalence of streptococci group A in all the age groups studied was of 11.52% being significantly greater (40.47%) among children of preschool age (4-6 years). The prevalence of streptococci group C was 2.3% with no carriers of groups B or G being observed.
  
  
  CONCLUSIONS
  The results of this study are in agreement with the literature reviewed in which asymptomatic carriers of streptococci group A were found to be principally school aged children who are those who most frequently have acute pharyngotonsilitis. Neither the pathogenicity of hemolytic streptococci B, which are not of group A, nor their epidemiologic implications are totally clear.
authors.affiliation: Servicio de Microbiología Clínica, Hospital Universitario San Carlos, Madrid.
authors.forename: C
authors.initials: C
authors.lastname: Betriu
authors.forename: J
authors.initials: J
authors.lastname: Romero
authors.forename: A
authors.initials: A
authors.lastname: Sánchez
authors.forename: M
authors.initials: M
authors.lastname: Sánchez
authors.forename: M
authors.initials: M
authors.lastname: Gómez
authors.forename: J J
authors.initials: JJ
authors.lastname: Picazo
authors.forename: M ]
authors.initials: M]
authors.lastname: Sánchez ML [corrected to Sánchez
mesh_terms: D000293:Adolescent; D002353:Carrier State / Q000453:epidemiology* / Q000382:microbiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D010614:Pharynx / Q000382:microbiology*; D015995:Prevalence; D013290:Streptococcal Infections / Q000453:epidemiology* / Q000382:microbiology; D013291:Streptococcus / Q000145:classification* / Q000302:isolation & purification
vernacular_title: Estudio del estado de portador de estreptococos betahemolíticos de los grupos A, B, C y G.