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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 types

Age group (years)

Total

< 9

9–19

19–29

29–39

39–49

≥ 49

n (%)

n (%)

n (%)

n (%)

n (%)

n (%)

n (%)

n = 11

n = 57

n = 70

n = 40

n = 26

n = 11

n = 215

MSP-1

 K1

4 (36.36)

17 (29.82)

23 (32.86)

9 (22.5)

11 (42.31)

1 (9.09)

65 (30.23)

 MAD20

2 (18.18)

21 (36.84)

33 (47.14)

13 (32.5)

10 (38.46)

5 (45.45)

84 (39.07)

 RO33

0 (0)

7 (12.28)

2 (2.86)

6 (15)

1 (3.85)

3 (27.27)

19 (8.84)

 K1/MAD20

4 (36.36)

4 (7.02)

5 (7.14)

8 (20)

3 (11.54)

1 (9.09)

25 (11.63)

 KI/RO33

0 (0)

1 (1.75)

0 (0)

1 (2.5)

0 (0)

0 (0)

2 (0.93)

 MAD20/RO33

0 (0)

1 (1.75)

0 (0)

1 (2.5)

0 (0)

0 (0)

2 (0.93)

 K1/MAD20/RO33

0 (0)

1 (1.75)

2 (2.86)

0 (0)

1 (3.85)

0 (0)

4 (1.86)

 Negative

1 (9.09)

5 (8.77)

5 (7.14)

2 (5)

0 (0)

1 (9.09)

14 (6.51)

 Multiclonal isolates

4 (36.36)

7 (12.28)

7 (10)

10 (25)

4 (15.38)

1 (9.09)

33 (15.35)

 Mean MOI

1.87 ± 0.77

1.88 ± 0.80

1.80 ± 0.90

1.74 ± 0.84

1.44 ± 0.57

1.73 ± 1.18

1.76 ± 0.85

MSP-2

 FC27

1 (9.09)

12 (21.05)

10 (14.29)

13 (32.5)

2 (7.69)

3 (27.27)

41 (19.07)

 3D7

2 (18.18)

8 (14.04)

7 (10)

5 (12.5)

8 (30.77)

0 (0)

30 (13.95)

 FC27/3D7

8 (72.73)

34 (59.65)

48 (68.57)

20 (50)

16 (61.54)

7 (63.64)

133 (61.86)

 Negative

0 (0)

3 (5.26)

5 (7.14)

2 (5)

0 (0)

1 (9.09)

11 (5.12)

 Multiclonal isolates

8 (72.73)

34 (59.65)

48 (68.57)

20 (50)

16 (61.54)

7 (63.64)

133 (61.86)

 Mean MOI

2.06 ± 1.23

2.09 ± 1.14

2.45 ± 1.29

2.16 ± 1.24

2.04 ± 1.39

2.28 ± 1.72

2.21 ± 1.29