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Rotavirus serology and breast-feeding in young children in rural Guinea-Bissau
G Gunnlaugsson1, L Smedman, M C da Silva
1Centre of Maternal and Child Health, Bissau, Guinea-Bissau.
Insights
Most children in Guinea-Bissau develop rotavirus antibodies by age 3. Proximity to main roads increased seroconversion risk, suggesting mobility influences transmission.
Area of Science:
- Pediatrics
- Infectious Diseases
- Immunology
- Epidemiology
Background:
- Rotavirus is a leading cause of severe diarrheal disease in infants and young children globally.
- Understanding rotavirus antibody development and transmission dynamics is crucial for public health interventions in resource-limited settings.
- Previous studies on rotavirus seroconversion in rural African populations are limited.
Purpose of the Study:
- To investigate the seroconversion rates and patterns of rotavirus antibodies in young children in rural Guinea-Bissau.
- To explore factors influencing rotavirus seroconversion, including age, geographic location, and breastfeeding status.
Main Methods:
- Longitudinal study involving 144 children aged 9-20 months in rural Guinea-Bissau.
- Blood samples collected twice over a 15-month period for rotavirus antibody analysis using immunofluorescence.
- Statistical analysis to determine seroconversion rates and relative risks associated with village location and age.
Main Results:
- Approximately 75% of children seroconverted to rotavirus during the study period, irrespective of initial age.
- Age-specific seropositivity increased significantly with age, from 10% at 9-11 months to 90% at 33-35 months.
- Children in villages near the main road had a 1.4 times higher relative risk of rotavirus seroconversion compared to those living off the road. Breastfeeding showed no significant impact on seroconversion.
Conclusions:
- Rotavirus infection leading to antibody development is highly prevalent in young children in rural Guinea-Bissau by the second year of life.
- Environmental factors, specifically proximity to main roads suggesting increased mobility and contact rates, play a significant role in rotavirus transmission.
- Age and mobility are key determinants of rotavirus exposure and subsequent antibody development in this population.
Abstract:
One hundred and forty-four children aged 9-20 months living in 14 villages in a rural area of Guinea-Bissau were examined for circulating rotavirus antibodies twice in a 15-month period. An immunofluorescence technique was used. About 3/4 of the children seroconverted, independent of age on entering the study. The age-specific proportion of seropositivity increased from 4/40 (10%) at 9-11 months to 26/29 (90%) at 33-35 months of age. All the initially seropositive children retained detectable antibodies to rotavirus. The relative risk of seroconversion was 1.4 times (95% confidence interval 1.0-2.0) more common among children living in villages by the mainroad as compared to those living off the road. Contact rate is probably dependent on population density and mobility but not on age. Breast-feeding, decreasing sharply through the age interval covered by the follow-up (9-35 months), had no apparent influence on seroconversion at the ages concerned.