Abstract
In Northern Nigeria some 11 000 blood films taken from infants were examined for the presence of malaria parasites during the course of WHO field trials of new insecticides. A first film was taken, in most cases, within the first month and the subsequent ones at monthly intervals thereafter. Analyses of the results obtained from these longitudinal studies were made according to the malaria transmission season, and infant parasite incidences were calculated.
The incidences thus obtained were found to be valuable in investigating the epidemiological situation in a particular locality, in assessing the effect of congenital immunity and in evaluating the efficacy of insecticidal attack.
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Selected References
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