article · Epidemiology and Infection
A 1994 community survey in Addis Ababa, Ethiopia, assessed rubella antibody prevalence across 4,666 individuals. The overall seroprevalence was 91 per cent, though it was lower among people who had lived in the city for one year or less. Transmission occurred early in life, with about 50 per cent of children infected by age four, an average infection age of 5.2 years, and the peak force of infection among children aged five to nine. Due to this widespread early infection, the estimated incidence of congenital rubella syndrome was low, at 0.3 per 1,000 live births, corresponding to nine cases in 1994. Achieving elimination would require an immunity level of 85 to 91 per cent, requiring 89 to 96 per cent coverage with a 95 per cent effective vaccine. Without achieving very high coverage, childhood vaccination could inadvertently increase the incidence of congenital rubella syndrome.
Understanding natural immunity is critical before launching mass vaccination programmes. In settings where rubella spreads heavily in early childhood, women of childbearing age often possess natural immunity, keeping birth defects from congenital rubella syndrome low. Introducing vaccination without achieving very high population coverage risks shifting the average age of infection upwards, potentially exposing more pregnant women to the virus.
The abstract does not indicate a commercial application pathway, as it focuses entirely on epidemiological surveillance and public health modelling. The findings are primarily relevant to health authorities and policy planners establishing coverage targets for vaccination programmes.
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We conducted a community-based cluster sample survey of rubella sero-epidemiology in Addis Ababa, Ethiopia in 1994. Among 4666 individuals for whom complete data were available, rubella antibody prevalence was 91% (95% confidence interval: 90, 92). On multivariable analysis, seroprevalence was lower among individuals who were resident in Addis Ababa for 1 year or less. Approx. 50% seroprevalence was attained by age 4 years, and the estimated average age at infection was 5.2 years. The highest age-specific force of infection was estimated to occur in 5- to 9-year-olds. The early age at infection corresponded with a low estimated incidence of congenital rubella syndrome (CRS) of 0.3 per 1000 live births, equivalent to nine cases of CRS in 1994. The predicted critical level of immunity for elimination of rubella via vaccination was 85-91%, requiring 89-96% coverage with a vaccine of 95% effectiveness. Unless very high coverage of rubella vaccine could be guaranteed, the introduction of childhood vaccination could increase the incidence of CRS in Addis Ababa.
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DOI: 10.1017/s0950268899003532
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