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A comparison of oral fluid and serum for the detection of rubella-specific antibodies in a community study in Addis Ababa, Ethiopia

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objective  To assess the utility of oral fluid compared with serum for the determination of age-prevalence of rubella-specific antibodies in an urban African community setting.

method  Paired serum and oral fluid samples were collected from 439 individuals aged 0–49 years in Addis Ababa, Ethiopia, as part of a larger seroepidemiological survey in 1994. Oral fluid was sampled using a simple sponge device that was well accepted by subjects of all ages; venous blood was collected by Vacutainer system. We measured rubella-specific antibodies in serum by the Radial Haemolysis (RH) test, supported by two confirmatory assays, and in oral fluid by IgG antibody-capture radioimmunoassay (GACRIA).

results  Sensitivity and specificity of oral fluid results compared to serum were 89% and 76%, respectively. Sensitivity declined from 96% in age group 0–19 years to 90% in age group 20–29 and 78% in age group 30–49. Specificity was 86% in 0–9 year olds contrasting with 61% in older groups (10–49 years). The positive predictive value of an oral fluid sample was high in all age groups (range 92–100%), while the negative predictive value declined from ≥80% in those aged <10 years to <10% in those aged ≥30 years. Serum confirmatory tests suggested a proportion of false serum RH negatives, increasing with age, indicating a need to standardize serum as well as oral fluid tests.

conclusion  In the community setting of a developing country, oral fluid surveys could be useful to estimate age-prevalence of rubella immunity and identify rubella-susceptible children for follow-up. Further work is required to simplify assays and sample processing, improve assay sensitivity and estimate assay specificity more precisely, and compare and standardise collection methods suitable for surveillance of a variety of childhood viral infections.
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Keywords: Ethiopia; age-prevalence; oral fluid; rubella-specific antibodies

Document Type: Research Article

Affiliations: 1: Department of Biological Sciences, University of Warwick, Coventry, UK, 2: Ethiopian Health and Nutrition Research Institute, Addis Ababa, Ethiopia, 3: Department of Community Health, Faculty of Medicine, University of Addis Ababa, Ethiopia, 4: Virus Reference Division, Central Public Health Laboratory, London, UK, 5: Infectious Disease Epidemiology Unit, London School of Hygiene and Tropical Medicine, UK

Publication date: 01 April 1998

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