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• W182013762 abstract "In a study in northern Liberia of the malaria and β-thalassaemia hypothesis, the frequencies of β-thalassaemia and HbS traits were 9·1 and 3·4% in the Mano and 9·5 and 1·7% in the Gio tribal samples. HbC and HbN were present at low frequency. G6PD deficiency was found in 16% of males. An observed increase with age of β-thalassaemia trait frequencies was consistent with the selection hypothesis. However, we could not entirely exclude that associated iron deficiency influenced the results in the six to 11 month age group. Malaria was holoendemic; Plasmodium falciparum predominated, P. malariae and P. ovale were also identified. Plasmodium falciparum prevalence rates were similar in normal and β-thalassaemia trait children but parasite densities were consistently lower in the latter. Using the criterion of a falciparum parasite density of 1 × 109 1−1 or greater to indicate a potentially important infection, the relative risk in β-thalassaemia traits one to four years old from the cross-sectional study was 0·45 (upper 95% confidence interval 0·79) and 0·41 (0·61) in two to nine year trait carriers from a longitudinal study. Plasmodium falciparum gametocyte rates were lower in β-thalassaemia trait children (P<0·005). The geometric mean titre of P. falciparum antibodies was lower in β-thalassaemia trait children from the one to four year group (P<0·05). Otherwise immunological studies showed little difference between the different Hb types. Parasitological findings were consistent with relative resistance of HbS trait carriers towards P. falciparum infection. We found no evidence for relative resistance of β-thalassaemia traits towards P. malariae infection nor that G6PD deficient males were more resistant to P. falciparum than those with normal activity.We conclude that the results are consistent with relative resistance of β-thalassaemia trait carriers to P. falciparum malaria." @default.
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• W182013762 date "1983-08-01" @default.
• W182013762 modified "2023-10-06" @default.
• W182013762 title "Falciparum malaria and β-thalassaemia trait in northern Liberia" @default.
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• W182013762 doi "https://doi.org/10.1080/00034983.1983.11811722" @default.
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