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Table 3 Antimicrobial susceptibility of Thai Streptococcus suis, serotype 2 (59 strains), non-serotype 2 (73 strains), autoagglutinating (91 strains), and non-typable (39 strains)

From: Antimicrobial susceptibility of Streptococcus suis isolated from diseased pigs, asymptomatic pigs, and human patients in Thailand

Antibiotic drugs

Serotype 2

59 strains

Non-serotype 2

73 strains

Autoagglutinating

91 strains

Non-typable

39 strains

P-value

S

I

R

S

I

R

S

I

R

S

I

R

AMP

58 (98.3%)

1 (1.7%)

0 (0%)

50 (68.5%)

6 (8.2%)

17 (23.3%)

56 (61.5%)

13 (14.3%)

22 (24.2%)

28 (71.8%)

5 (12.8%)

6 (15.4%)

<  0.001*

CFL

58 (98.3%)

0 (0%)

1 (1.7%)

41 (56.2%)

4 (5.5%)

28 (38.3%)

46 (50.5%)

0 (0%)

45 (49.5%)

20 (51.3%)

1 2.6%)

18 (46.1%)

<  0.001*

CTX

58 (98.3%)

0 (0%)

1 (1.7%)

65 (89.0%)

2 (2.7%)

6 (8.3%)

88 (96.7%)

1 (1.1%)

2 (2.2%)

33 (84.6%)

1 2.6%)

5 (12.8%)

0.078

CTF

58 (98.3%)

0 (0%)

1 (1.7%)

69 (94.5%)

1 (1.4%)

3 (4.1%)

88 (96.7%)

1 (1.1%)

2 (2.2%)

33 (84.6%)

3 (7.7%)

3 (7.7%)

0.053

PEN

57 (96.6%)

1 (1.7%)

1 (1.7%)

22 (30.1%)

34 (46.6%)

17 (23.3%)

26 (28.5%)

35 (38.5%)

30 (33.0%)

14 (35.9%)

17 (43.6%)

8 (20.5%)

<  0.001*

VAN

59 (100%)

0 (0%)

0 (0%)

69 (94.6%)

2 (2.7%)

2 (2.7%)

90 (98.9%)

1 (1.1%)

0 (0%)

35 (89.8%)

2 (5.1%)

2 (5.1%)

0.972

AZM

5 (8.5%)

0 (0%)

54 (91.5%)

8 (11.0%)

0 (0%)

65 (89.0%)

16 (17.6%)

3 (3.3%)

72 (79.1%)

11 (28.2%)

1 (2.6%)

27 (69.2%)

0.063

CHL

53 (89.8%)

6 (10.2%)

0 (0%)

61 (83.6%)

5 (6.8%)

7 (9.6%)

83 (91.2%)

1 (1.1%)

7 (7.7%)

32 (82.1%)

5 (12.8%)

2 (5.1%)

0.032*

CLI

5 (8.5%)

0 (0%)

54 (91.5%)

4 (5.5%)

0 (0%)

69 (94.5%)

3 (3.3%)

0 (0%)

88 (96.7%)

5 (12.8%)

0 (0%)

34 (87.2%)

0.187

DOX

0 (0%)

0 (0%)

59 (100%)

8 (11.0%)

1 (1.4%)

64 (87.6%)

11 (12.1%)

2 (2.2%)

78 (85.7%)

5 (12.8%)

2 (5.1%)

32 (82.1%)

0.078

ERY

4 (6.8%)

5 (8.5%)

50 (84.7%)

8 (11.0%)

1 (1.4%)

64 (87.6%)

19 (20.9%)

1 (1.1%)

71 (78.0%)

12 (30.8%)

0 (0%)

27 (69.2%)

0.002*

FFC

52 (88.1%)

1 (1.7%)

6 (10.2%)

70 (95.9%)

0 (0%)

3 (4.1%)

85 (93.4%)

0 (0%)

6 (6.6%)

36 (92.3%)

1 (2.6%)

2 (5.1%)

0.443

GEN

33 (55.9%)

8 (13.6%)

18 (30.5%)

26 (35.6%)

17 (23.3%)

30 (41.1%)

25 (27.5%)

28 (30.7%)

38 (41.8%)

16 (41.0%)

8 (20.5%)

15 (38.5%)

0.027*

TET

0 (0%)

0 (0%)

59 (100%)

2 (2.7%)

3 (4.1%)

68 (93.2%)

6 (6.6%)

1 (1.1%)

84 (92.3%)

5 (12.8%)

3 (7.7%)

31 (79.5%)

0.023*

TIA

1 (1.7%)

30 (50.8%)

28 (47.5%)

2 (2.7%)

8 (11.0%)

63 (86.3%)

1 (1.1%)

4 (4.4%)

86 (94.5%)

2 (5.1%)

3 (7.7%)

34 (87.2%)

<  0.001*

CIP

47 (79.6%)

7 (11.9%)

5 (8.5%)

38 (52.1%)

12 (16.4%)

23 (31.5%)

50 (54.9%)

10 (11.0%)

31 (34.1%)

20 (51.3%)

7 (17.9%)

12 (30.8%)

0.008*

ENR

32 (54.2%)

27 (45.8%)

0 (0%)

38 (52.1%)

13 (17.8%)

22 (30.1%)

55 (60.4%)

9 (9.9%)

27 (29.7%)

18 (46.1%)

7 (17.9%)

14 (35.9%)

<  0.001*

NOR

15 (25.4%)

27 (45.8%)

17 (28.8%)

17 (23.3%)

18 (24.6%)

38 (52.1%)

21 (23.1%)

20 (22.0%)

50 (54.9%)

12 (30.8%)

8 (20.5%)

19 (48.7%)

0.203

LEV

59 (100%)

0 (0%)

0 (0%)

48 (65.8%)

4 (5.5%)

21 (28.7%)

67 (73.6%)

1 (1.1%)

23 (25.3%)

28 (71.8%)

1 (2.6%)

10 (25.6%)

<  0.001*

SXT

46 (78.0%)

2 (3.4%)

11 (18.6%)

22 (30.1%)

3 (4.1%)

48 (65.8%)

16 (17.6%)

2 (2.2%)

73 (86.2%)

11 (28.2%)

3 (7.7%)

25 (64.1%)

<  0.001*

  1. AMP ampicillin, AZM azithromycin, CTX cefotaxime, CTF ceftiofur, CFL cephalexin, CHL chloramphenicol, CIP ciprofloxacin, CLI clindamycin, DOX doxycycline, ENR enrofloxacin, ERY erythromycin, FFC florfenicol, GEN gentamicin, LEV levofloxacin, NOR norfloxacin, PEN penicillin G, SXT sulfamethoxazole/trimethoprim, TET tetracyclin, TIA tiamulin, VAN: vancomycin. S: susceptible; I: intermediate; R: resistant. The asterisk indicates statistical significance with P-value < 0.05