Design of antimicrobial susceptibility testing programmes relevant to aquaculture and aquacultural products
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1 FMM/RAS/298: Strengthening capacities, policies and national action plans on prudent and responsible use of antimicrobials in fisheries Workshop 2 in cooperation with Malaysia Department of Fisheries and INFOFISH 7-9 August 2017, Kuala Lumpur, Malaysia Design of antimicrobial susceptibility testing programmes relevant to aquaculture and aquacultural products Peter Smith peter.smith@nuigalway.ie
2 An expert is someone who knows some of the worst mistakes that can be made in his subject, and how to avoid them. Werner Heisenburg
3 SELECTING A STANDARD TESTING PROTOCOL FOR YOUR SPECIES OF INTEREST Medium & incubation temperature All members of species should give sufficient growth Availability of QC ranges Protocol should have QC ranges for antimicrobials of interest Availability of interpretive criteria(epidemiological cut-off values) These are protocol and species specific. Few are available, They are essential but easy to set (NRI and ECOFFinder). Should not influence selection of any testing protocol
4 GROUP 1 NON FASTIDIOUS G-VE SPECIES Aeromonas caviae Aeromonas veronii Edwardsiella tarda Aeromonas hydrophila Acinetobacter spp Edwardsiella anguillarum Aeromonas jandaei Citrobacter spp Pseudomonas anguilliseptica Aeromonas salmonicida Edwardsiella piscicida Pseudomonas fluorescens Aeromonas sobria Edwardsiella ictaluri Yersinia ruckeri Medium All can be tested with unmodified Mueller-Hinton Temperature All (except Aeromonas salmonicida) can be tested at 35 C, 28 C & 22 C THERE ARE STANDARD PROTOCOLS FOR ALL GROUP 1 SPECIES
5 QC acceptable ranges using M-H media MIC Disc Temperature ( C) & & 22 Agents used in aquaculture Amoxicillin/ampicillin Chloramphenicol Doxycycline Enrofloxacin Erythromycin Florfenicol Flumequine Nitrofurantoin Ormetoprim-sulfadimethoxine Oxolinic acid Oxytetracycline Trimethoprim Trimethoprim-sulfamethoxazole Sulphamethoxazole Agents used in humans Various
6 GROUP 2 NON-FASTIDIOUS G-VE FACULTATIVE AND OBLIGATE HALOPHILES Mesophiles Vibrio anguillarum Vibrio parahaemolyticus Photobacterium damselae Vibrio harveyi Vibrio vulnificus Psychrophile Aliivibrio salmonicida DO ANY REQUIRE ADDITION OF 1% NaCl TO MUELLER- HINTON?
7 QC acceptable ranges using M-H media + 1% NaCl MIC Disc Temperature ( C) & & 22 Agents used in aquaculture Amoxicillin/ampicillin Chloramphenicol Doxycycline Enrofloxacin Erythromycin Florfenicol Flumequine Nitrofurantoin Ormetoprim-sulfadimethoxine Oxolinic acid Oxytetracycline Trimethoprim Trimethoprim-sulfamethoxazole Sulphamethoxazole Agents used in humans Various
8 QC acceptable ranges using M-H media MIC Disc Temperature ( C) & & 22 Agents used in aquaculture Amoxicillin/ampicillin Chloramphenicol Doxycycline Enrofloxacin Erythromycin Florfenicol Flumequine Nitrofurantoin Ormetoprim-sulfadimethoxine Oxolinic acid Oxytetracycline Trimethoprim Trimethoprim-sulfamethoxazole Sulphamethoxazole Agents used in humans Various
9 GROUP 2A NON-FASTIDIOUS G-VE FACULTATIVE HALOPHILES Medium There is evidence that all the mesophilic halophiles listed have been tested with unmodified Mueller-Hinton Temperature There is evidence that the mesophilic halophiles can be tested at 28 C & 22 C. Most (except V. anguillarum?) can be tested at 35 C
10 GROUP 2B NON-FASTIDIOUS G-VE OBLIGATE HALOPHILES If any halophilic species are encountered that cannot be tested on un-modified Mueller-Hinton it is recommended that 1% NaCl should be added. THERE ARE NO QC ACCEPTABLE RANGES FOR MUELLER-HINTON MEDIA WITH 1% NaCl
11 GROUP 3 FLAVOBACTERIA AND RELATED SPECIES Flavobacterium branchiophilum Flavobacterium psychrophilum Flavobacterium columnare Tenacibaculum maritimum Media Standard protocols for MIC testing of the Flavobacteria spp. specify the use of dilute Mueller-Hinton broth Temperature F. columnare is tested at 28 C F. psychrophilum and F. branchiophilum at 18 C THERE ARE NO STANDARD PROTOCOLS FOR T. maritimum OR FOR DISC DIFFUSION TESTING OF ANY OF THESE 4 SPECIES
12 MIC QC acceptable ranges using dilute M-H media 28 C 18 C Reference strain E. coli A. sal E. coli A. sal Agents used in aquaculture Amoxicillin/ampicillin Chloramphenicol Doxycycline Enrofloxacin Erythromycin Florfenicol Flumequine Nitrofurantoin Ormetoprim-sulfadimethoxine Oxolinic acid Oxytetracycline Trimethoprim Trimethoprim-sulfamethoxazole Sulphamethoxazole Agents used in humans Various
13 GROUP 4 G+VE COCCI Aerococcus viridans Streptococcus iniae Lactococcus garvieae Streptococcus phocae Streptococcus agalactiae Weissella spp. Streptococcus dysgalactiae DO THESE SPECIES REQUIRE ADDITION OF BLOOD PRODUCTS?
14 GROUP 4 G+VE COCCI Medium The current recommendation is the M-H media should be supplemented with blood products and incubation should be in 5% CO 2 There is evidence that the G+ve cocci listed can be tested with unmodified Mueller-Hinton incubated in air. Temperature There is evidence that the G+ve cocci can be tested at 28 C & 22 C. Most (except S. phocae ) can be tested at 35 C
15 QC acceptable ranges at 35 C with and without blood products MIC Disc Additions none Blood CO 2 none Blood CO 2 Reference strain E. coli S. pneumoniae Amoxicillin/ampicillin Chloramphenicol Doxycycline Enrofloxacin Erythromycin Florfenicol Flumequine Nitrofurantoin Ormetoprim-sulfadimethoxine Oxolinic acid Oxytetracycline Trimethoprim Trimethoprim-sulfamethoxazole Sulphamethoxazole Agents used in aquaculture Agents used in humans E. coli S. pneumoniae Various
16 QC acceptable ranges at 28 C with and without blood products MIC Disc Additions none Blood CO 2 none Blood CO 2 Reference strain E. coli/a.sal S. pneumoniae Amoxicillin/ampicillin Chloramphenicol Doxycycline Enrofloxacin Erythromycin Florfenicol Flumequine Nitrofurantoin Ormetoprim-sulfadimethoxine Oxolinic acid Oxytetracycline Trimethoprim Trimethoprim-sulfamethoxazole Sulphamethoxazole Agents used in aquaculture Agents used in humans E. coli S. pneumoniae Various
17 GROUP 5 MYCOBACTERIA AND RELATED SPECIES Mycobacterium fortuitum Nocardia asteroides N. seriolae M. marinum N. crassostreae PROTOCOLS FOR TESTING THESE SPCIES ARE AVALABLE IN CLSI GUIDELINE M42-A2
18 GROUP 6 MISCELLANEOUS SPECIES Clostridium botulinum Francisella noatunensis Hepatobacter penaei Piscirickettsia salmonis Renibacterium salmoninarum THERE ARE NO STANDARD PROTOCOLS FOR THESE SPECIES
19 SELECTING A STANDARD TESTING PROTOCOL FOR YOUR SPECIES OF INTEREST Summary CLSI standard susceptibility test protocols with QC ranges for species or groups Number examined 42 MIC protocols available 35 Disc protocols available 28
20 SELECTING A STANDARD TESTING PROTOCOL FOR YOUR SPECIES OF INTEREST Summary Species for which no standard protocols have been set Aliivibrio salmonicida Francisella noatunensis Piscirickettsia salmonis Tenacibaculum maritimum Clostridium botulinum Hepatobacter penaei Renibacterium salmoninarum Antimicrobial agents listed as used in aquaculture for which no QC ranges have been set Josamycin, Neomycin, Thiamphenicol, Sulfamethoxazole Antimcrobial agents which can be paired Amoxycillin / Ampicillin Oxytetracycline / Doxycycline Oxolinic acid / Flumequine Ormetoprim-sulfadimethoxine / Trimethoprim-sulfamethoxazole
21 STUDY DESIGN
22 To establish the susceptibility to the antimicrobial agents used as therapeutic agents in aquaculture of the bacterial species that are the primary targets of that use. Species Those that are the most frequent targets of antibiotic therapy in aquaculture Agents Those that are most frequently used in aquaculture Strain collection Diagnostic investigations of infected animals or sampling of the immediate environment of infected populations
23 To investigate the public heath implications of the presence of bacteria with reduced antimicrobial susceptibility in aquaculture products Species Those that are the most frequent causes of infections in humans requiring antimicrobial therapy mediated by the consumption of or contact with aquacultural products Agents Those that are the most frequently used in humans as therapeutic treatments of the food-borne or contact-transmitted infections associated with aquacultural products Strain collection From aquaculture product at point-of-sale
24 To investigate the public heath implications of antimicrobial agent use in aquaculture mediated through aquaculture products Species Those that are the most frequent causes of infections in humans mediated by the consumption of or contact with aquacultural products Agents Those that are the most frequently used in humans as therapeutic treatments of the food-borne or contact-transmitted infections associated with aquacultural products Strain collection Strains must be collected both from the water entering the farm and the aquaculture product leaving the farm
25 To investigate the impact of antimicrobial agent use in aquaculture on the susceptibility to antimicrobial agents of the microflora in the local environment of aquaculture enterprises Studies of this type involve the detection of gene sequences and do not involve the isolation or phenotypic study of bacteria
26 Science is built of facts just as a house is built of bricks, but a pile of facts is no more a science than a pile of bricks is a house. Henri Poincaré It is easy to generate data It is only when we use appropriate methods in well designed studies that we learn what they mean GOOD LUCK IN ALL YOUR WORK
Antimicrobial Resistance (AMR) in Aquaculture
Antimicrobial Resistance (AMR) in Aquaculture Melba.Reantaso@fao.org AMR Side Event, COFI/SCA 9 25 October 2017, Rome, Italy http://www.fao.org/cofi/aq/90408/en/ Benefits on the use of antimicrobials Antimicrobial
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More informationReceived 4 April 2003/Returned for modification 23 May 2003/Accepted 11 June 2003
JOURNAL OF CLINICAL MICROBIOLOGY, Sept. 2003, p. 4318 4323 Vol. 41, No. 9 0095-1137/03/$08.00 0 DOI: 10.1128/JCM.41.9.4318 4323.2003 Copyright 2003, American Society for Microbiology. All Rights Reserved.
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