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Table 3 Distribution of msp1 and msp2 allelic types of P. falciparum among different parasite densities in the China–Myanmar border region

From: Genetic polymorphism of merozoite surface proteins 1 and 2 of Plasmodium falciparum in the China–Myanmar border region

Allelic typeParasite density (no. of parasites/µl of blood)Total
< 500500–10001000–25002500–10,00010,000–100,000≥100,000n (%)
n (%)n (%)n (%)n (%)n (%)n (%)
n = 11n = 22n = 44n = 66n = 61n = 11n = 215
msp1
 K14 (36.36)9 (40.91)18 (40.91)18 (27.27)14 (22.95)2 (18.18)65 (30.23)
 MAD205 (45.45)8 (36.36)17 (38.64)29 (43.94)22 (36.07)3 (27.27)84 (39.07)
 RO330 (0)0 (0)2 (4.55)3 (4.55)8 (13.11)6 (54.55)19 (8.84)
 K1/MAD202 (18.18)5 (22.73)2 (4.55)9 (13.64)7 (11.48)0 (0)25 (11.63)
 KI/RO330 (0)0 (0)0 (0)0 (0)2 (3.28)0 (0)2 (0.93)
 MAD20/RO330 (0)0 (0)0 (0)0 (0)2 (3.28)0 (0)2 (0.93)
 K1/MAD20/RO330 (0)0 (0)0 (0)3 (4.55)1 (1.64)0 (0)4 (1.86)
 Negative0 (0)0 (0)5 (11.36)4 (6.06)5 (8.2)0 (0)14 (6.51)
 Multiclonal isolates2 (18.18)5 (22.73)2 (4.55)12 (18.18)12 (19.67)0 (0)33 (15.35)
 Mean MOI1.32 ± 0.681.52 ± 0.731.67 ± 0.681.91 ± 0.861.80 ± 0.952.02 ± 0.831.76 ± 0.85
msp2
 FC270 (0)1 (4.55)5 (11.36)17 (25.76)16 (26.23)2 (18.18)41 (19.07)
 3D71 (9.09)5 (22.73)10 (22.73)6 (9.09)3 (4.92)5 (45.45)30 (13.95)
 FC27/3D710 (90.91)15 (68.18)26 (59.09)41 (62.12)38 (62.3)3 (27.27)133 (61.86)
 Negative0 (0)1 (4.55)3 (6.82)2 (3.03)4 (6.56)1 (9.09)11 (5.12)
 Multiclonal isolates10 (90.91)15 (68.18)26 (59.09)41 (62.12)38 (62.3)3 (27.27)133 (61.86)
 Mean MOI1.32 ± 0.681.52 ± 0.731.67 ± 0.681.89 ± 0.861.80 ± 0.952.02 ± 0.832.21 ± 1.29