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Allele frequency of msp1 in persons with Plasmodium falciparum infection, North Central Nigeria, 2015–2018. The K1 allele of size 200–250 bp was detected at the highest frequency (n = 18). The next highest detected were the MAD20 allele of fragment size 150–200 bp (n = 11) and the RO33 alleles of fragment sizes 100–150 bp (n = 9) and 650–700 bp (n = 9).
