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Frequency of detecting MSP-1 Block2 alleles in 60 children's parasitemias from birth to 3 years of life. Using MSP-1 K1-, Mad20-, and RO-specific primers, 668 parasitemias were genotyped. There were 23 K1, 20 Mad20, and 1 RO. The frequency of detection was the number of samples (parasitemic) with the allele divided by the total samples tested. Parasitemias following a month of aparasitemia or an antimalaria treatment (isolated parasitemias) gave similar distributions (data not shown).
