Dr. Mary Torrence - NARMS – Surveillance On The Farm
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Transcript of Dr. Mary Torrence - NARMS – Surveillance On The Farm
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Mary. E. Torrence DVM, Ph.D., DACVPMNational Program Leader, Food Safety
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In 2011- 2012, USDA, FDA, and university scientists initiated pilot studies to inform revisions to on-farm sampling designs within NARMS
Goals:o Pilot the “process” of sustainably collecting on-farm
samples, performing primary isolation, and shipping isolates to FDA for sensitivity testing
o Provide preliminary data in poultry, beef and dairy cattle to help define sources of variation in prevalence and AMR
o Bring in epidemiology expertise to collaborate with microbiologists
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Broilers and turkeys for Campylobacter and Salmonella using bootsock sampling
Feedlot cattle for E. coli and Salmonella using fresh fecal pats and cecals
Dairy cattle for Salmonella and E. coli using 1) on-farm and 2) longitudinal (on-farm to buying station to slaughter plant)
Swine conducted in collaboration with Russell Research Center and OSU
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Convenience sample based on higher production regions
Mix of cross-sectional and longitudinal to capture variation between animals and between farms
Primary isolation and culture- Isolates sent to FDA for sensitivity analysis
Test coding scheme (blinded)
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HI
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CACO
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OH
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PA
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WY
Dairy (~2.5%)
Broilers (~43%)
Turkey (~40%)
Feedlot (~66%)
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Dairy SamplingFa
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twice monthly
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Dairy Sampling Scheme 2
cross-sectional: 320 samples/period(2 periods = 640 samples)
longitudinal: 400 samples total
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Poultry- 20% Salmonella and 65% Campylobacter. Feedlot- E. coli, almost 100%, Salmonella varied by
region- Salmonella was around 60% in south. Close to 60% pan-susceptible, Range of 1 up to 9
antibiotics that are resistant
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“Process” still needs work to facilitate rapid exchange of samples, isolates and data
On-farm sampling is labor intensive but offers a mechanism for sporadic animal monitoring
Long term collaboration with industry is critical
Consortia take energy and coordination
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Final analysis of AMR data will allow us to design sampling scheme focused on most relevant sources of variation and the question to be answeredoAmount of variation directly informs sample size
On-farm sampling enables the implementation of focused, short-term research questions
Consortia provide support and collaboration for future projects
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Finalize animal sampling plan and solicit stakeholder input
Refine and expand consortium Pilot antibiotic use survey on-farm Developing a research component into NARMS
(e.g. prevalence of ESBL, intervention) Assess sources of variation at the slaughter
(matched pair design)
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Pilot studies have provided data to contribute to the future NARMS plan
A “consortium” of expertise will enable interactions among industry, academia, and government and future research
Voluntary AMR monitoring on-farm is complicated and resource intensive