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The results of epidemiological surveys and the follow-up of malaria endemicity are often difficult to compare due to the high frequency of low-density parasitaemia in semi-immune populations. Detecting malaria parasites is dependent on the conditions and methods of parasitological examination. A standardized method of examination in epidemiological surveys is proposed: this includes the systematic rapid determination of parasite density.
J F Trape (Tue,) studied this question.