Molecular typing of Streptococcus pyogenes from remote Aboriginal communities where rheumatic fever is common and pyoderma is the predominant streptococcal infection

Epidemiol Infect. 2007 Nov;135(8):1398-405. doi: 10.1017/S0950268807008023. Epub 2007 Feb 19.

Abstract

Aboriginal Australians in remote communities have high rates of rheumatic heart disease (RHD); yet pharyngitis is reportedly rare whilst pyoderma is common. Some strains of group A streptococci (GAS) have preference for the throat and others for the skin depending on M protein type. A study in three remote communities provided 350 GAS isolates for emm sequence typing, 244 were also emm pattern typed. There was 100% correlation between emm sequence and pattern type. Patterns D and E (non-throat tropic) made up 71% of throat and 87% of skin isolates although patterns A-C (throat tropic) were more common in the throat than the skin (RR 2.3, 95% CI 1.4-3.8) whilst the opposite was found for pattern D (RR 2.2, 95% CI 1.7-3.0). Pattern E favoured the throat (RR 1.4, 95% CI 1.1-1.8). Where environmental factors predispose to skin infection, emm pattern types D and E prevail, whatever the recovery site.

MeSH terms

  • Antigens, Bacterial / genetics
  • Australia / epidemiology
  • Bacterial Outer Membrane Proteins / genetics
  • Bacterial Typing Techniques*
  • Carrier Proteins / genetics
  • Child
  • DNA, Bacterial / genetics
  • Female
  • Genotype
  • Humans
  • Male
  • Pharynx / microbiology
  • Pyoderma / epidemiology*
  • Pyoderma / microbiology
  • Rheumatic Fever / epidemiology*
  • Rheumatic Fever / microbiology
  • Rural Population
  • Sequence Analysis, DNA
  • Skin / microbiology
  • Streptococcal Infections / epidemiology*
  • Streptococcal Infections / microbiology*
  • Streptococcus pyogenes / classification*
  • Streptococcus pyogenes / isolation & purification

Substances

  • Antigens, Bacterial
  • Bacterial Outer Membrane Proteins
  • Carrier Proteins
  • DNA, Bacterial
  • streptococcal M protein