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Table 3 AMR profiles of Aeromonas spp. isolated in 2013 and 2016

From: Motile aeromonads from farmed and wild freshwater fish in northern Italy: an evaluation of antimicrobial activity and multidrug resistance during 2013 and 2016

Antimicrobials

No. of resistant isolates (%)

Chi-square index (χ2)

2013

2016

Cloxacillin

31 (100)

64 (100)

/

Spiramycin

31 (100)

64 (100)

/

Tilmicosin

31 (100)

64 (100)

/

Ampicillin

30 (96.8)

64 (100)

0.14

Tylosin

31 (100)

63 (98.4)

0

Penicillin

31 (100)

62 (96.9)

0.05

Amoxicillin

29 (93.5)

63 (98.4)

0.43

Sulfadiazine

31 (100)

61 (95.3)

0.36

Tiamulin

27 (87.1)

54 (84.4)

0

Neomycin**

12 (38.7)

45 (70.3)

7.42

Erythromycin**

25 (80.6)

30 (46.9)

8.43

Cephaloridine*

23 (74.2)

28 (43.8)

6.61

AMC*

8 (25.8)

35 (54.7)

5.91

Apramycin**

6 (19.4)

33 (51.6)

7.67

Tetracycline*

10 (32.3)

8 (12.5)

4.1

SXT

8 (25.8)

8 (12.5)

1.78

Nalidixic acid

5 (16.1)

10 (15.6)

0

Thiamphenicol**

9 (29.0)

4 (6.3)

7.35

Kanamycin

2 (6.5)

9 (14.1)

0.56

Danofloxacin

1 (3.2)

8 (12.5)

1.15

Enrofloxacin

4 (12.9)

4 (6.3)

0.49

Flumequine

1 (3.2)

6 (9.4)

0.43

Aminosidine

1 (3.2)

5 (7.8)

0.17

Colistin

1 (3.2)

5 (7.8)

0.17

Ceftiofur

2 (6.5)

4 (6.3)

0

Doxycycline

2 (6.5)

3 (4.7)

0

Florfenicol

0

3 (4.7)

0.36

Gentamicin

1 (3.2)

2 (3.1)

0

Marbocyl

1 (3.2)

2 (3.1)

0

Cefquinome

0

0

/

  1. Significant differences between Aeromonas spp. isolated in 2013 and 2016 were indicated by: * P < 0.05; ** P < 0.01; *** P < 0.001