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Journal of Clinical Microbiology, April 1998, p. 902-907, Vol. 36, No. 4
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Group A Streptococcal Vir Types Are M-Protein Gene (emm) Sequence Type Specific

Don L. Gardiner,1,* Alison M. Goodfellow,1 Diana R. Martin,2 and Kadaba S. Sriprakash1

Menzies School of Health Research, Darwin, Australia,1 and ESR, Communicable Disease Centre, Porirua, New Zealand2

Received 10 September 1997/Returned for modification 16 October 1997/Accepted 14 December 1997

The M-protein genes (emm genes) of 103 separate impetiginous Streptococcus pyogenes isolates were sequenced and the sequence types were compared to the types obtained by Vir typing. Vir typing is based on restriction fragment length polymorphism (RFLP) analysis of a 4- to 7-kb pathogenicity island encoding emm and other virulence genes. By using both HaeIII and HinfI to generate RFLP profiles, complete concordance between Vir type and emm sequence type was found. Comparison of the emm sequences with those in GenBank revealed new sequence types sharing less than 90% identity with known types. Diversity in the emm sequence was generated by corrected frameshift mutations, point mutations, and small in-frame mutations.


* Corresponding author. Mailing address: Menzies School of Health Research, Combined Health Building, Building 58, Royal Darwin Hospital, Rocklands Dr., Tiwi 0812, Northern Territory, Australia. Phone: 61-8-89228006. Fax: 61-8-89275187. E-mail don{at}menzies.su.edu.au.


Journal of Clinical Microbiology, April 1998, p. 902-907, Vol. 36, No. 4
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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