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Vi serology in screening of typhoid carriers: improved specificity by detection of Vi antibodies by counterimmunoelectrophoresis

Published online by Cambridge University Press:  25 March 2010

P. Y. Chau  and
R. S. W. Tsang
P. Y. Chau
Affiliation:
University of Hong Kong, Department of Microbiology, Pathology Building, Queen Mary Hospital Compound, Hong Kong
R. S. W. Tsang
Affiliation:
University of Hong Kong, Department of Microbiology, Pathology Building, Queen Mary Hospital Compound, Hong Kong
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A purified soluble Vi antigen was used in counterimmunoelectrophoresis (CIE), passive haemagglutination (HA) and solid phase radio-immunoassay (SPRIA) for detection of serum Vi antibody. Serum Vi antibody was detected in 13 of 14 chronic typhoid carriers by both CIE and HA. SPRIA studies showed that Vi antibodies in sera of these carriers were mainly of the IgG class. Successful treatment with amoxycillin in one carrier, who initially showed a positive Vi test, resulted in a reversion in 6 months to seronegativity as measured by Vi CIE. However, Vi antibody was also detected in 10 sera (3%) from 329 control subjects by HA but not by CIE. When the CIE assay was applied to 1030 serum specimens obtained from hospitalized patients, it was able to detect one typhoid carrier, but one (0·1%) non-carrier also gave a positive Vi CIE test. It is thus concluded that Vi CIE is more specific and no less sensitive than Vi HA for the detection of the typhoid carrier state. The finding by SPRIA that the anti-Vi antibodies present in typhoid carriers' sera were mainly of the IgG class further justified the use of CIE as a precipitation test for their detection.

Type
Research Article
Information
Journal of Hygiene , Volume 89 , Issue 2 , October 1982 , pp. 261 - 267
Copyright
Copyright © Cambridge University Press 1982

References

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