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On estimating the basic reproduction number for Schistosoma haematobium
M E Woolhouse1, G Hasibeder, S K Chandiwana
1Department of Zoology, University of Oxford, UK.
Tropical Medicine & International Health : TM & IH
|August 1, 1996
Summary
Schistosomiasis elimination may be harder than expected. New mathematical models suggest the basic reproduction number (R0) for schistosomes is higher, between 4-5 or more, challenging previous estimates.
Area of Science:
- Epidemiology
- Mathematical Biology
- Parasitology
Background:
- Existing estimates for the basic reproduction number (R0) of human schistosomes (1-4) suggest easy elimination, contradicting field observations.
- This discrepancy highlights a need for more accurate R0 estimations in endemic areas.
Purpose of the Study:
- To estimate the R0 for human schistosomes using a novel mathematical model.
- To investigate the impact of age-dependent exposure and acquired immunity on schistosome transmission dynamics.
Main Methods:
- Development of a mathematical model incorporating age-dependent exposure and acquired immunity.
- Estimation of transmission and immunity parameters using field data from a Zimbabwean site.
- Inclusion of population heterogeneity through "wormy" and "non-wormy" fractions.
Main Results:
- The study estimates R0 for schistosomes to be 4-5 or higher, exceeding previous figures.
- Despite moderate infection levels at the study site, the R0 suggests significant transmission potential.
- Model sensitivity analysis indicates that less realistic models yield less reliable R0 estimates.
Conclusions:
- Higher R0 estimates challenge the feasibility of easy schistosomiasis elimination.
- Incorporating age-dependent exposure and acquired immunity is crucial for accurate transmission modeling.
- The findings underscore the importance of using sophisticated models for effective public health strategies against schistosomiasis.