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Binding of IgA and/or IgG is a common property among clinical isolates of group A streptococci

Published online by Cambridge University Press:  15 May 2009

G. Lindahl  and
L. Stenberg
G. Lindahl
Affiliation:
Department of Medical Microbiology, University of Lund, Sölvegatan 23, S-223 62 Lund, Sweden
L. Stenberg
Affiliation:
Department of Medical Microbiology, University of Lund, Sölvegatan 23, S-223 62 Lund, Sweden
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Summary

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Certain strains of group A streptococci are known to bind IgA and/or IgG via a cell surface receptor, which may act as a virulence factor. The distribution of such receptors among routine clinical isolates was studied, using a total of 225 strains and an assay based on the binding of radiolabelled immunoglobulins. Among 194 throat strains isolated during three different time periods in two different geographical areas of Sweden, 82% showed significant binding of IgA and/or IgG. Studies on 31 septicaemia strains, isolated over a period of more than 8 years, showed binding for 84% of the isolates. The binding strains were of several different T-types and could be subdivided into two groups, those binding both IgA and IgG and those binding IgG only. These data show that binding of IgA and/or IgG is a very common property among clinical isolates of group A streptococci.

Type
Special Article
Information
Epidemiology & Infection , Volume 105 , Issue 1 , August 1990 , pp. 87 - 93
Copyright
Copyright © Cambridge University Press 1990

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