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Antibiotic susceptibility of mycobacteria isolated from ornamental fish

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25 mar 2022
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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
Lingua:
Inglese
Frequenza di pubblicazione:
4 volte all'anno
Argomenti della rivista:
Scienze biologiche, Biologia molecolare, Microbiologia e virologia, Scienze della vita, altro, Medicina, Medicina veterinaria