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Antibiotic susceptibility of mycobacteria isolated from ornamental fish

Leszek Guz
Leszek Guz
 e 
Krzysztof Puk
Krzysztof Puk
   | 25 mar 2022
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Pubblicato online: 25 mar 2022
Pagine: 69 - 76
Ricevuto: 03 set 2021
Accettato: 01 mar 2022
DOI: https://doi.org/10.2478/jvetres-2022-0011
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© 2022 L. Guz, K. Puk., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Antimicrobial resistance or susceptibility determined by microdilution

NTM species (number of isolates tested) Resistant (R) or susceptible (S) Percentage of strains resistant or susceptible for each antimicrobial agent
Amikacin Kanamycin Tobramycin Doxycycline Clarithromycin Ciprofloxacin Sulfamethoxazole Rifampicin Isoniazid
M. abscessus (n = 1) R 100.00 100.00 100.00 100.00 100.00
I 100.00
S 100.00 100.00 100.00
M. chelonae (n = 16) R 6.25 43.75 100.00 6.25 100.00 100.00 100.00 100.00
I 12.50 12.50 50.00
S 81.25 87.50 6.25 93.75
M. fortuitum (n = 10) R 10.00 100.00 90.00 50.00 10.00 10.00 100.00 100.00
I 10.00 40.00
S 90.00 90.00 10.00 10.00 90.00 90.00
M. (n gordonae = 15) R 20.00 6.67 20.00 93.33 100.00
I 46.67
S 100.00 100.00 33.33 100.00 93.33 80.00 100.00 6.67
M. marinum (n = 33) R 3.03 9.09 12.12 93.94 100.00
I 87.88 3.03
S 100.00 100.00 9.09 90.91 96.97 87.88 100.00 6.06
M. (n mucogenicum = 1) R 100.00 100.00 100.00 100.00 100.00
I 100.00
S 100.00 100.00 100.00
M. neoaurum (n = 2) R 100.00 100.00
I
S 100.00 100.00 100.00 100.00 100.00 100.00 100.00
M. peregrinum (n = 12) R 8.33 8.33 8.33 66.67 8.33 8.33 100.00 100.00
I 33.33 8.33 8.33
S 91.67 91.67 58.33 25.00 83.34 91.67 100.00
M. salmoniphilum (n = 1) R 100.00 100.00 100.00
I
S 100.00 100.00 100.00 100.00 100.00 100.00
M. saopaulense (n = 1) R 100.00 100.00 100.00 100.00
I 100.00 100.00
S 100.00 100.00 100.00
M. senegalense (n = 4) R 25.00 25.00 75.00 25.00 100.00 100.00
I 25.00 25.00
S 100.00 100.00 75.00 75.00 75.00 75.00
M. septicum (n = 2) R 50.00 100.00 100.00
I 50.00 50.00
S 100.00 100.00 100.00 100.00 50.00 100.00
M. szulgai (n = 1) R 100.00 100.00 100.00
I
S 100.00 100.00 100.00 100.00 100.00 100.00

Antibiotic susceptibility profiles of RGM and SGM isolated from diseased fish

Antimicrobial agent Susceptibility
RGM (n = 50)
 SGM (n = 49)
S I R S I R
AMK 90.00 4.00 6.00 100 0.00 0.00
KAN 92.00 6.00 2.00 100 0.00 0.00
TOB 32.00 28.00 40.00 16.33 73.47 10.20
DOX 18.00 4.00 78.00 93.88 0.00 6.12
CLR 72.00 12.00 16.00 95.92 2.04 2.04
CIP 48.00 8.00 44.00 83.67 0.00 16.33
SMX 60.00 0.00 40.00 100.00 0.00 0.00
RMP 0.00 0.00 100.00 6.12 0.00 93.88
INH 0.00 0.00 100.00 2.04 0.00 97.96

MIC breakpoints used for categorisation of susceptibility of RGM and SGM to nine antimicrobial agents

Antimicrobial agent Range (μg/mL) MIC breakpoints (μg/mL)
RGM
 SGM
S I R S I R
AMK 1–128 ≤16 32 ≥64 - - >32
KAN 1–64 ≤16 32 ≥64 - - >32
TOB 1–64 ≤1 2–4 ≥8 - - >4
DOX 0.25–32 ≤2 4 ≥8 ≤2 4 ≥8
CLR 0.25–32 ≤2 4 ≥8 ≤8 16 ≥32
CIP 0.125–16 ≤1 2 ≥4 - - >2
SMX 1–64 ≤32 - ≥64 ≤32 - ≥64
RMP 0.25–64 - - >1 - - >1
INH 1–64 - - ≥5 - - ≥5
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