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Seroepidemiology of group B streptococcus type II antibody specificity

Published online by Cambridge University Press:  15 May 2009

B. M. Gray*
Affiliation:
Departments of Pediatrics and Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
D. G. Pritchard*
Affiliation:
Departments of Pediatrics and Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
J. D. Springfield*
Affiliation:
Departments of Pediatrics and Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
R. J. Benak*
Affiliation:
Departments of Pediatrics and Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
H. C. Dillon Jr*
Affiliation:
Departments of Pediatrics and Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
*
Correspondence to B. M. Gray, M.D.University of Albama at Birmingham, Department of pediatrics, University station, Birmingham, Alabama, 35294
Correspondence to B. M. Gray, M.D.University of Albama at Birmingham, Department of pediatrics, University station, Birmingham, Alabama, 35294
Correspondence to B. M. Gray, M.D.University of Albama at Birmingham, Department of pediatrics, University station, Birmingham, Alabama, 35294
Correspondence to B. M. Gray, M.D.University of Albama at Birmingham, Department of pediatrics, University station, Birmingham, Alabama, 35294
Correspondence to B. M. Gray, M.D.University of Albama at Birmingham, Department of pediatrics, University station, Birmingham, Alabama, 35294
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The specificity of human antibodies for the two major sidechain determinants of the type II group B streptococcal (GBS) polysaccharide was examined in 90 pairs of maternal and cord sera. Using an ELISA system, total antibody was measured against the complete (sialylated) type II antigen and the proportion of antibody against the galactose determinant was estimated by inhibition with free β–methylgalactopyranosided. Mothers colonized by type II or by other GBS types had higher levels of total specific antibody (means, 33 and 4–7 µg/ml, respectively) than those not colonized (mean, 2–2 µg/ml). Cord sera averaged 1–2 µg/ml lower than maternal sera. Colonization with GBS was also associated with higher levels against the galactose determinant (mean, 1.5&µg/ml, compared to 0–7µg/ml for those not colonized). The distribution of specificities favoured antibodies against the sialic acid determinant in maternal but not cord sera. Specificity as well as antibody level may play a role in the epidemiology of GBS type II.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1988

References

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