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Group A streptococcal infections: trend and strain emm typing in an area of central Italy, 1985–2002

Published online by Cambridge University Press:  12 May 2005

M. MENCARELLI ,
R. CORBISIERO ,
M. G. PADULA ,
I. GALGANI ,
L. STOLZUOLI  and
C. CELLESI
M. MENCARELLI
Affiliation:
Clinic and Laboratory of Infectious Diseases, Department of Molecular Biology, University of Siena, Siena, Italy
R. CORBISIERO
Affiliation:
Clinic and Laboratory of Infectious Diseases, Department of Molecular Biology, University of Siena, Siena, Italy
M. G. PADULA
Affiliation:
Clinic and Laboratory of Infectious Diseases, Department of Molecular Biology, University of Siena, Siena, Italy
I. GALGANI
Affiliation:
Clinic and Laboratory of Infectious Diseases, Department of Molecular Biology, University of Siena, Siena, Italy
L. STOLZUOLI
Affiliation:
Clinic and Laboratory of Infectious Diseases, Department of Molecular Biology, University of Siena, Siena, Italy
C. CELLESI
Affiliation:
Clinic and Laboratory of Infectious Diseases, Department of Molecular Biology, University of Siena, Siena, Italy
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Abstract

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A retrospective study of group A streptococcal (GAS) infections was performed for the period 1985–2002 in an area of central Italy. Although very severe diseases such as streptococcal toxic shock syndrome (STSS) were observed, a general increase in invasive infections was not found. Isolates of GAS were classified by M protein genotyping (emm typing) and analysed according to their origin from invasive and non-invasive infections. The predominant emm types were types 1, 4 and 12, followed by types 3, 6 and 28. During the study period the proportion of isolates of types 1 and 12 fell, while other types (3, 6, 22, 28 and 77) appeared. Isolates from invasive and non-invasive infections shared several emm types; however, most invasive strains belonged to five types only (types 1, 4, 12, 28 and 77), while non-invasive isolates were generally more heterogeneous.

Type
Short Report
Information
Epidemiology & Infection , Volume 133 , Issue 6 , December 2005 , pp. 1107 - 1111
Copyright
2005 Cambridge University Press