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Table 2 Bactericidal activity* (% reduction in CFU) of J14 peptide antisera against Thai GAS isolates with different emm types

From: Bactericidal activity of M protein conserved region antibodies against group A streptococcal isolates from the Northern Thai population

Isolate no.

emm type

J14 (KALE)

J14.1 (ADLA)

J14-R1 (KDLA)

J14-R2 (AEHQ)

  

IMS/NMS

% reduction

IMS/NMS

% reduction

IMS/NMS

% reduction

IMS/NMS

% reduction

1

ST9

94.5 ± 20.8/200.6 ± 81.8

52.89 ± 10.36

110.5 ± 19.3/200.6 ± 81.8

44.92 ± 9.62

123.5 ± 17.3/200.6 ± 81.8

38.43 ± 8.63

82.9 ± 17.1/200.6 ± 81.8

58.67 ± 8.54

2

M109

34.6 ± 9.5/4025 ± 1753

99.14 ± 0.24

45.1 ± 28.6/4025 ± 1753

98.88 ± 0.71

38.3 ± 26.4/4025 ± 1753

99.05 ± 0.66

25.6 ± 7.8/4025 ± 1753

99.36 ± 0.19

3

M70

215.5 ± 136.5/5171 ± 1916

95.83 ± 2.64

123.9 ± 101.9/5171 ± 1916

97.60 ± 1.97

217.1 ± 112.9/5171 ± 1916

95.80 ± 2.18

152.5 ± 55.2/5171 ± 1916

97.05 ± 1.07

4

M44

10.5 ± 6.4/297.6 ± 140

96.47 ± 2.16

14.1 ± 7.5/297.6 ± 140

95.25 ± 2.52

63 ± 22.7/297.6 ± 140

78.83 ± 7.61

3.8 ± 3.1/297.6 ± 140

98.72 ± 1.03

5

M66

31.8 ± 9.5/117 ± 129

72.86 ± 8.11

11.2 ± 8.3/117 ± 129

90.46 ± 7.05

18.7 ± 11.1/117 ± 129

84.05 ± 9.45

5.2 ± 2.6/117 ± 129

95.58 ± 2.19

6

M3

102.9 ± 43.8/1514 ± 532

93.21 ± 2.89

268.4 ± 69.7/1514 ± 532

82.28 ± 4.60

634.3 ± 187.7/1514 ± 532

58.11 ± 12.4

30.4 ± 11.4/1514 ± 532

97.99 ± 0.75

7

ST1

7.5 ± 2.3/20.8 ± 8.2

63.94 ± 11.02

4.1 ± 1.5/20.8 ± 8.2

80.17 ± 7.18

10.2 ± 2.8/20.8 ± 8.2

51.12 ± 13.24

11.3 ± 1.3/20.8 ± 8.2

45.51 ± 6.05

8

STBSA29

16.4 ± 9.7/59.9 ± 44.9

72.66 ± 16.16

15.0 ± 3.5/59.9 ± 44.9

74.96 ± 5.84

29.2 ± 6.3/59.9 ± 44.9

51.31 ± 10.44

7.8 ± 4.5/59.9 ± 44.9

86.92 ± 7.57

9

M49

25.9 ± 14.8/278.5 ± 251

90.99 ± 5.15

31.6 ± 16.2/278.5 ± 251

89.01 ± 5.64

24.8 ± 22.1/278.5 ± 251

91.39 ± 7.68

22.5 ± 16.3/278.5 ± 251

92.17 ± 5.67

10

M22

52.9 ± 44.4/3437 ± 1099

98.46 ± 1.29

155.4 ± 66.7/3437 ± 1099

95.48 ± 1.94

246.1 ± 66.8/3437 ± 1099

92.84 ± 1.94

24.2 ± 11.6/3437 ± 1099

99.30 ± 0.34

11

ST8

391.3 ± 55.0/2336 ± 381

83.25 ± 2.36

663.2 ± 124.9/2336 ± 381

71.60 ± 5.35

485.8 ± 59.0/2336 ± 381

79.20 ± 2.52

576.8 ± 26.4/2336 ± 381

75.31 ± 1.13

12

M75

125.3 ± 75.1/1661 ± 1014

92.46 ± 4.52

191.2 ± 48.9/1661 ± 1014

88.49 ± 2.94

119 ± 79.1/1661 ± 1014

92.84 ± 4.77

75.9 ± 28.2/1661 ± 1014

95.43 ± 1.70

13

TR2612

394.3 ± 34.4/7776 ± 3043

94.93 ± 0.44

606.8 ± 163.4/7776 ± 3043

92.20 ± 2.10

212.6 ± 21.1/7776 ± 3043

97.27 ± 0.27

440.6 ± 69.2/7776 ± 3043

94.33 ± 0.89

14

ST3

3.0 ± 1.2/14.7 ± 8.3

79.59 ± 7.86

2.0 ± 1.1/14.7 ± 8.3

86.39 ± 7.35

1.1 ± 1.3/14.7 ± 8.3

92.35 ± 8.95

6.0 ± 2.6/14.7 ± 8.3

59.18 ± 17.78

15

ST10

22.2 ± 9.6/1284 ± 961

98.27 ± 0.75

82.6 ± 31.6/1284 ± 961

93.56 ± 2.46

52.6 ± 22.0/1284 ± 961

95.90 ± 1.71

61.8 ± 14.8/1284 ± 961

95.19 ± 1.15

16

ST6735

30.5 ± 4.5/87.5 ± 47

65.14 ± 5.13

75.7 ± 13.0/87.5 ± 47

13.52 ± 14.84

49.5 ± 6.5/87.5 ± 47

43.43 ± 7.43

51.0 ± 7.7/87.5 ± 47

41.71 ± 8.80

17

M13

72.6 ± 31.2/1130 ± 571

93.57 ± 2.76

196.5 ± 27.0/1130 ± 571

82.61 ± 2.39

320.3 ± 124.4/1130 ± 571

71.65 ± 11.0

46.6 ± 25.0/1130 ± 571

95.87 ± 2.21

18

M18

386.0 ± 68.2/2113 ± 650

81.73 ± 3.23

362.1 ± 157.9/2113 ± 650

82.86 ± 7.47

215.3 ± 195.4/2113 ± 650

89.81 ± 9.25

124.2 ± 54.2/2113 ± 650

94.12 ± 2.57

19

M74

270.8 ± 75.2/664.5 ± 228

59.24 ± 11.32

429.8 ± 83.4/664.5 ± 228

35.31 ± 12.55

383 ± 60.6/664.5 ± 228

42.36 ± 9.12

368.5 ± 42.9/664.5 ± 228

44.54 ± 6.45

20

M5

375.6 ± 47.4/1092 ± 154.9

65.60 ± 4.34

608.5 ± 24.2/1092 ± 154.9

44.28 ± 2.21

645.7 ± 54.3/1092 ± 154.9

40.87 ± 4.97

303.2 ± 44.4/1092 ± 154.9

72.23 ± 4.07

  1. * The value is an average of experiment done in quadruplicate.
  2. IMS/NMS: mean CFU in immune serum ± SD/mean CFU in normal serum ± SD