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Detection of specific IgM in varicella and herpes zoster by antibody-capture redioimmunoassay

Published online by Cambridge University Press:  15 May 2009

H. O. Kangro ,
A. Ward ,
S. Argent ,
R. B. Heath ,
J. E. Cradock-Watson  and
Margaret K. S. Ridehalgh
H. O. Kangro
Affiliation:
Department of Virology, St Bartholomew's Hospital, West Smithfield, London EC1A 7BE
A. Ward
Affiliation:
Department of Virology, St Bartholomew's Hospital, West Smithfield, London EC1A 7BE
S. Argent
Affiliation:
Department of Virology, St Bartholomew's Hospital, West Smithfield, London EC1A 7BE
R. B. Heath
Affiliation:
Department of Virology, St Bartholomew's Hospital, West Smithfield, London EC1A 7BE
J. E. Cradock-Watson
Affiliation:
Public Health Laboratory, Withington Hospital, Manchester M20 8LR
Margaret K. S. Ridehalgh
Affiliation:
Public Health Laboratory, Withington Hospital, Manchester M20 8LR
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Summary

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A simple and sensitive M antibody-capture radioimmunoassay (MACRIA) is described which utilizes crude commercial VZV antigen and a single monoclonal anti-VZV antibody. This was compared to the immunofluorescence (IF) test for IgM antibody and was used to study IgM responses in sera from 261 patients with varicella and 220 patients with herpes zoster.

With MACRIA, IgM antibodies were detected in all patients with varicella. The IgM antibodies appeared shortly after onset of rash, reached peak levels between 1 and 4 weeks after onset and then declined to low or undetectable levels in most, though not all, patients after 3 months. IgM antibodies were also detected in 98·2% of patients with herpes zoster, but the levels of IgM were significantly lower than after varicella and there was wider individual variation both in magnitude and duration of the IgM responses, in some cases only lasting 2–3 weeks.

Comparison between MACRIA and IF showed good agreement in the detection of IgM antibodies following varicella. Discordant results were obtained with 13% of sera. of which 81% were taken either early or late after onset of rash and contained very low IgM levels. In contrast, 62 (28%) of the 220 sera from patients with zoster gave discordant results in the two tests, all except five being MACRIA positive but IF-negative. The largest proportion of discordant results were obtained with sera taken more than 3 months after onset of rash, but 18 (29%) contained high IgM levels and were taken during the period of peak IgM responses. The diagnostic applications of the VZV MACRIA are discussed.

Type
Special Article
Information
Epidemiology & Infection , Volume 101 , Issue 1 , August 1988 , pp. 187 - 195
Copyright
Copyright © Cambridge University Press 1988

References

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