title: Perianal streptococcal dermatitis. The possible protective role of alpha-streptococci against spread and recurrence of group A streptococcal throat infection.
abstract: OBJECTIVE
  To follow the spread of beta-haemolytic streptococci group A (GAS) within a family and examine the protective activity of normally occurring alpha-streptococci against GAS tonsillitis.
  
  
  METHODS
  Follow up of recurrent GAS throat infection within a family.
  
  
  METHODS
  Intra familial spread of GAS.
  
  
  METHODS
  A family of four, the mother suffering from recurrent streptococcal tonsillitis and a son with perianal streptococcal dermatitis.
  
  
  RESULTS
  The strain of the GAS found in the perianal region of the boy was identical with that found in the throat of his mother. She had recurrent streptococcal tonsillitis, while the boy remained healthy in the throat. She lacked interfering alpha-streptococci in the throat, while the boy had a massive growth of alpha-streptococci in his throat with capacity to inhibit the growth of the streptococcal isolate.
  
  
  METHODS
  Infection with GAS within a family correlated with the growth-inhibiting activity of the alpha-streptococci in vitro.
  
  
  CONCLUSIONS
  The study demonstrated the spread of GAS from a patient with streptococcal dermatitis to the throat of another person within the family, and the hindrance of induction of infection in patients carrying interfering alpha-streptococci.
authors.affiliation: Department of ENT, Lundby Hospital, Göteborg, Sweden.
authors.forename: K
authors.initials: K
authors.lastname: Roos
authors.forename: L
authors.initials: L
authors.lastname: Lind
authors.forename: S E
authors.initials: SE
authors.lastname: Holm
authors.forename: E
authors.initials: E
authors.lastname: Grahn-Håkansson
mesh_terms: D001004:Anus Diseases / Q000276:immunology / Q000382:microbiology*; D002675:Child, Preschool; D003872:Dermatitis / Q000276:immunology / Q000382:microbiology*; D005192:Family Health; D005260:Female; D006801:Humans; D008297:Male; D013290:Streptococcal Infections / Q000276:immunology*; D013297:Streptococcus pyogenes / Q000276:immunology*; D014069:Tonsillitis / Q000276:immunology / Q000382:microbiology*