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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Altitude-dependent and -independent variations in Plasmodium falciparum prevalence in Northeastern Tanzania
Journal of Infectious Diseases, Volume 191, No. 10, Year 2005
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Description
Background. Effective malaria control requires information about intensity of transmission across large areas and populations. Estimates based on entomological factors lack precision and are not cost-effective to obtain. We tested altitude and rainfall measurements as correlates of transmission intensity in different ecological settings. Methods. We conducted 2 cross-sectional surveys of ∼12,000 people (1-45 years old) in 6 altitude transects (150-1800 m) in the Kilimanjaro and Tanga regions of Tanzania. Data were analyzed for associations with altitude and rainfall estimates by use of appropriate regression models. Results. Plasmodium falciparum prevalence showed a negative relationship with altitude (19% and 21% decrease/100-m altitude increase, respectively, in children in Kilimanjaro and Tanga) and rainfall during the 3 months before the survey (46% decrease/100-mm rainfall increase in children in Kilimanjaro). Mean hemoglobin concentrations increased with altitude (0.05 and 0.09 g/dL/100-m altitude increase, respectively, in children in Kilimanjaro and Tanga) and rainfall (0.17 g/dL/100-mm rainfall increase in children and adults in Kilimanjaro). Discussion. Altitude and rainfall were correlated with parasite prevalence and mean hemoglobin concentration; however, the relationship varied according to ecological setting. Climatological variables alone cannot predict malarial outcomes. Local variations in seasonality of malaria transmission - together with vector species composition, topography, host and parasite genetics, and socioeconomic factors - may influence malaria prevalence. © 2005 by the Infectious Diseases Society of America. All rights reserved.
Authors & Co-Authors
Drakeley, Chris J.
Unknown Affiliation
Carneiro, Ilona A.M.
Unknown Affiliation
Reyburn, Hugh G.
Unknown Affiliation
Malima, Robert C.
Unknown Affiliation
Lusingu, John Peter Andrea
Unknown Affiliation
Cox, Jonathan St H.
Unknown Affiliation
G. Theander, Thor Grundtvig
Unknown Affiliation
Nkya, Watoky M.M.M.
Unknown Affiliation
Lemnge, Martha M.M.
Unknown Affiliation
Riley, Eleanor M.
Unknown Affiliation
Statistics
Citations: 160
Authors: 10
Affiliations: 6
Identifiers
Doi:
10.1086/429669
ISSN:
00221899
Research Areas
Genetics And Genomics
Infectious Diseases
Maternal And Child Health
Study Design
Cross Sectional Study
Study Approach
Quantitative
Study Locations
Tanzania