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Table 2 Distribution of msp1 and msp2 allelic types of P. falciparum among different age groups 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 typesAge group (years)Total
< 99–1919–2929–3939–49≥ 49n (%)
n (%)n (%)n (%)n (%)n (%)n (%)
n = 11n = 57n = 70n = 40n = 26n = 11n = 215
MSP-1
 K14 (36.36)17 (29.82)23 (32.86)9 (22.5)11 (42.31)1 (9.09)65 (30.23)
 MAD202 (18.18)21 (36.84)33 (47.14)13 (32.5)10 (38.46)5 (45.45)84 (39.07)
 RO330 (0)7 (12.28)2 (2.86)6 (15)1 (3.85)3 (27.27)19 (8.84)
 K1/MAD204 (36.36)4 (7.02)5 (7.14)8 (20)3 (11.54)1 (9.09)25 (11.63)
 KI/RO330 (0)1 (1.75)0 (0)1 (2.5)0 (0)0 (0)2 (0.93)
 MAD20/RO330 (0)1 (1.75)0 (0)1 (2.5)0 (0)0 (0)2 (0.93)
 K1/MAD20/RO330 (0)1 (1.75)2 (2.86)0 (0)1 (3.85)0 (0)4 (1.86)
 Negative1 (9.09)5 (8.77)5 (7.14)2 (5)0 (0)1 (9.09)14 (6.51)
 Multiclonal isolates4 (36.36)7 (12.28)7 (10)10 (25)4 (15.38)1 (9.09)33 (15.35)
 Mean MOI1.87 ± 0.771.88 ± 0.801.80 ± 0.901.74 ± 0.841.44 ± 0.571.73 ± 1.181.76 ± 0.85
MSP-2
 FC271 (9.09)12 (21.05)10 (14.29)13 (32.5)2 (7.69)3 (27.27)41 (19.07)
 3D72 (18.18)8 (14.04)7 (10)5 (12.5)8 (30.77)0 (0)30 (13.95)
 FC27/3D78 (72.73)34 (59.65)48 (68.57)20 (50)16 (61.54)7 (63.64)133 (61.86)
 Negative0 (0)3 (5.26)5 (7.14)2 (5)0 (0)1 (9.09)11 (5.12)
 Multiclonal isolates8 (72.73)34 (59.65)48 (68.57)20 (50)16 (61.54)7 (63.64)133 (61.86)
 Mean MOI2.06 ± 1.232.09 ± 1.142.45 ± 1.292.16 ± 1.242.04 ± 1.392.28 ± 1.722.21 ± 1.29