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. 1976 Dec;58(6):1379–1387. doi: 10.1172/JCI108593

Assessment of group B streptococcal opsonins in human and rabbit serum by neutrophil chemiluminescence.

V G Hemming, R T Hall, P G Rhodes, A O Shigeoka, H R Hill
PMCID: PMC333309  PMID: 62761

Abstract

The factors important in host defense against group B streptococci are not well understood. The role of antibody and complement in the prevention of serious infection by these organisms is not known because, to date, a reliable measure of functional opsonic activity has not been developed. Recently, it has been shown that neutrophils produce a chemiluminescence after ingestion of particulate matter, and that this event can be detected and quantitated in a liquid scintillation system. We have adapted the chemiluminescence procedure to examine rabbit hyperimmune and human serum for the presence of group B streptococcal opsonins. Group B streptococci of types Ia, II, and III that were opsonized in homologous but not heterologous type serum produced a peak in chemiluminescence when added to normal human neutrophils. Such activity was correlated, in each instance, with ingestion of bacteria by neutrophils and deposition of immunoglobulin and C3 on the bacterial surface as detected by indirect immunofluorescence. With this assay, we have examined sera from colonized and diseased patients for the presence of opsonins to types Ia, II, and III group B streptococci. Maternal sera often contained type-specific opsonins which resided in the IgG fraction and which crossed the placenta to appear in paired cord specimens. 63% of patients colonized with group B streptococci had serum opsonins to their colonizing type of organism. In contrast, none of the 15 patients with sepsis or meningitis had opsonins directed against their infecting strain. These data suggest that the lack of type-specific opsonins to group B streptococci may be one of the important factors in determining host susceptibility to systemic infection with strains of this group.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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