Detection of Low-Avidity Immunoglobulin G in Oral Fluid Samples: New
Approach for Rubella Diagnosis and Surveillance
D. Akingbade, B. J. Cohen, and D. W. G. Brown*
Enteric, Respiratory, and Neurological Virus Laboratory, Central Public
Health Laboratory, London NW9 5HT, United Kingdom
Received 31 May 2002/ Returned for modification 25 July 2002/ Accepted 11
September 2002
Low-avidity rubella immunoglobulin G (IgG) was detected in oralfluid samples from 30 of 32 rubella IgM-positive patients (sensitivity,94%) and from 4 of 34 IgM-negative patients (specificity, 88%).
Measuring IgG avidity in oral fluid samples could improve the
reliability of rubella surveillance when the incidence of thedisease
and the positive predictive value of IgM tests are low.
* Corresponding author. Mailing address: Enteric, Respiratory,
and Neurological Virus Laboratory, Central Public Health Laboratory, London NW9
5HT, United Kingdom. Phone: 44 208 200 4400. Fax: 44 208 205 8195. E-mail:
dbrown@phls.org.uk.
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