dr. richard raymond - food safety & antibiotics: perceptions vs. reality
DESCRIPTION
Food Safety & Antibiotics: Perceptions vs. Reality - Dr. Richard Raymond, Former Undersecretary for Food Safety, U.S. Department of Agriculture, from the 2014 Iowa Pork Congress, January 22-23, Des Moines, IA, USA. More presentations at http://www.swinecast.com/2014-iowa-pork-congressTRANSCRIPT
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ANTIBIOTICS USED IN ANIMALS RAISED FOR FOOD
PERCEPTION VS. REALITY
Iowa Pork CongressDes Moines, Iowa
January 23, 2014
Richard Raymond,
M.D.
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Potential Conflict of Interest
Consulting relationship with Elanco
Consulting relationship with Merck Animal Health
Member of Tyson Fresh Foods Animal Well Being Advisory Panel.
None have contributed to this presentation nor to travel expenses here and back.
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My Goals for Today
1. I want you to be able to go home and discuss the issue with media, community leaders and your customers
2. Some of the numbers being thrown around are meant to misinform and cause alarm, so what are the factual and important numbers?
3. Do we know all the facts about how antibiotic resistance occurs?
4. What is a Super Bug? 5. Can MRSA spread from animals to humans, and if so,
is that important in this debate? 6. Is there a link to antibiotic use in animals and
antibiotic resistance being a threat to your health?
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Perception vs. Reality
Foodborne Illnesses down 29% in last decade Media hits for foodborne illness outbreaks up
150% in last decade Media hits for recalls of food up 250% in last
decade ( Peanut Corporation of America; Wright Egg Farms; Jensen Family Farms; Hallmark/Westland; Salinas Valley Spinach farm)
Pink Slime/Foster Farms Consumers often view technology as bad
business
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Technology is not just Beta-agonists and Antibiotics
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Definition: Antibiotics
Antibiotics are antimicrobials that are actually produced by a microorganism and can kill or inhibit the growth of other microorganisms.
EXAMPLE: Penicillin from the Penicillium fungi used against many bacteria.
Most antibiotics, like penicillin, are used to kill or inhibit reproduction in bacteria, but that is not a requirement to meet the definition.
EXAMPLE: Monensin from Streptomyces cinnamonensis used commonly to prevent parasitic diseases such as Coccidiosis . (Ionophores)
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Definition: Antibiotics
By strictest definition, only 75% of antimicrobials used against microorganisms are antibiotics, the rest are synthetic compounds.
But since congresswoman Slaughter, the Pew Charitable Trust, the Consumers Union, etc., all lump them all together when they claim 80% of antibiotics sold in the U.S. are used in perfectly healthy animals raised for food, I will lump them together also for today’s discussion.
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Def: Antibiotic Resistance
When an organism that was susceptible to an antibiotic is no longer killed or its growth suspended by the same antibiotic.
How resistance develops is not totally understood but it is probably a DNA change, that may be spontaneous by accident, may be a result of exposure to an antibiotic or may be from transfer of DNA from another microbe.
Reality: “If you think you understand how microbes develop resistance to antibiotics, then it hasn’t been properly explained to you.” (Guy Loneragan, DVM)
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Def: Low Dose vs. High Dose ABX
A low dose may prevent an infection in the herd or flock
Without a prevention or control dose, illnesses may result requiring higher doses of antibiotics for a longer time to a larger number of animals
Is “low dose use” or “high dose use” more likely to cause resistance? We don’t know.
Reality: The Danish experience in prohibiting antibiotic use as growth promoters resulted in a 110% increase in total antibiotics prescribed by DVMs, nearly 75% of all abx sold in Denmark and that does not include the ionophore class.
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Denmark
P
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Def: ”Subtherapeutic dosing”
Sometimes terms such as “non-therapeutic” or “sub-therapeutic” are inappropriately used by groups to describe the use of antimicrobials in animals to promote growth, prevent disease, control disease and to improve feed efficiency.
Perception: The inappropriate use of “subtherapeutic” is intended to deceive and paint a bad picture of Animal Ag practices
Reality: The FDA and AVMA do not use these terms as they are incorrect describers of an FDA approved use and approved dose for the intended results.
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FDA Approved Uses of ABX in Feed Animals
Treatment of infectious diseases (antibiotics only to sick animals)
Control of infectious diseases (disease is present in members of the flock or herd)
Prevention of infectious diseases (there is a known disease risk, such as weather, weaning, disease in neighboring herd or flock, etc.)
Growth promotion/Feed efficiency (Maximize production from animals, at least cost)
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FDA Approved use of Antibiotics in Human Medicine
Treatment of sick individuals Control: Administration of antibiotics to
students sharing a class room or dormitory setting with a student diagnosed with bacterial meningitis (low dose, not sub-therapeutic dose)
Prevention: Administration of an antibiotic to a person with an artificial or damaged heart valve before undergoing a dental procedure to prevent endocarditis (low dose, not sub-therapeutic dose)
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Federal Government’s Role in Antibiotic Use in Food Animals
Food and Drug Administration (FDA): Regulates antimicrobial use and collects data on
sales. Has authority to remove a product from use for food producing animals if a danger is felt to be present in human health, as it did in 2005 when it announced that enrofloxacin could no longer be used in poultry and banned all off label use in food animals and in 2012 when it took similar action for some cephalosporins. Has also limited or prohibited use of Methicillin, Vancomycin, Cipro, and aminoglycosides to protect human health.
Establishes Maximum Residue Limits (MRLs) for antibiotics in meat and poultry
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Federal Government’s Role (cont.)
National Antimicrobial Resistance Monitoring System (NARMS) was established by HHS, USDA and the CDC to perform research and provide information about antimicrobial resistance in humans, animals and retail meats.
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This Year’s Report on Meat and Poultry
(NARMS) February retail meat report: Ampicillin resistance in Salmonella is increasing Ciprofloxacin resistance in Campylobacter is
down from 29% to 18% since FDA banned its use in 2005
“No isolates were resistant to Vancomycin or Linezolid. These are classes of drugs of critical importance in human medicine but not used in food animal production.” (FDA in NARMS report)
“no flouroquinolone resistance in Salmonella from any source. This is the drug of choice for treating adults with Salmonellosis.” (FDA)
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More NARMS report
Macrolide resistance in Campylobacter remained low at 4.3% for C coli and 0.5% for C jejuni. Macrolides are the drugs of choice to treat Campylobacter.
Multi-drug resistance (MDR) increased in Salmonella while remaining very rare in Campylobacter but exposure was the same. Once again, we don’t know why.
Nalidixic Acid ( A Quinolone banned for use in poultry in 2005) resistance in E coli in turkey dropped from 10% to 1%
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Multidrug Resistant Salmonella
Perception: The February NARMS report stated that MDR Salmonella was increasing in percentage. Those against the slaughter of animals for food acted enraged and alarmed.
Reality: The February NARMs report shows that for retail chicken and ground turkey, the four most common antibiotics that Salmonella showed resistance to were tetracycline, streptomycin, sulfisoxazole and penicillin
Reality: None of these drugs would be used to treat a Salmonella infection. Macrolides, Bactrim DS and quinolones are first line antibiotics for foodborne illnesses and little or no resistance in Salmonella was found in the NARMS study
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FDA’s Comments on the EWG’s report on the NARMs report
“We do not believe the EWG fully considered important factors”
“NARMS data indicates that first-line treatments for all four bacteria that we track are still effective.”
“We believe EWG is inaccurate and alarmist to define bacteria resistance to one, or even a few, antimicrobials as ‘superbugs’ if these bacteria are treatable by other commonly used antibiotics.”
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Political Perception after the NARMS Report
Congresswoman Slaughter’s response to the NARMS report: “We are standing on the Brink of a Public Health Disaster.”
“Without some knowledge of the scientific process, people tend to be whipsawed by speculation, pseudo-science and preliminary hints, many of which are contradictory.” (Angell-Science on Trial)
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FDA’s GFI #213 December 2013
Specific direction for drug sponsors on how to make voluntary changes to the status of their products such as: 1. voluntary removal of performance indications and change in marketing status 2. Sponsor can seek new therapeutic indications at current doses
Must notify of intent within 90 days of final publication of GFI #213
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The Numbers Game
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Hyperbole leads to Deaf Ears
“Over 80% of all antibiotics sold in the United States are given to perfectly healthy animals raised for food.” (Congresswoman Slaughter, Watchdog and advocacy groups, multiple media and bloggers.)
“All antibiotics administered to animals raised for food are given under the direct supervision and direction of a Doctor of Veterinary medicine” (Animal Ag Industry)
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The Numbers Game
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FDA Report on Antimicrobials
http://www.fda.gov/downloads/ForIndustry/UserFees/AnimalDrugUserFeeActADUFA/UCM338170.pdf
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Antibiotic Use Numbers
FDA does not agree with the 80% often cited by Congresswoman Slaughter and others
Misleading as it represents sales, not use, and not all abx sold are given to animals
Any number cited includes companion animals and treatment of disease. (FDA footnote #2)
Numbers are in kilograms, and some antibiotics are given in 10 mg doses, and others in 1 gram doses.
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Kilograms vs. Milligrams
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Reality Check
FDA 2011 report on all “antibiotics sold or distributed for use in food-producing animals”:
Ionophores 28.3% (30% in 2012) (not used in human medicine at all)
Tetracyclines 41.5% (Of very limited use in human medicine with many better choices available)
NIR 12% (Almost none used in human medicine) Cephalosporins 0.2% (Of critical importance to
human medicine, and limited to therapeutic treatment only in animals)
Flouroquinolones 0.1% (Same limits as Ceph.)
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Not Individually Reported (NRI)
Nine classes of drugs in this grouping, representing 12% of all animal sales in 2010.
Reality: Of the 813,489 kg sold in 2009 for use in animals:
Those sold only for use animals totaled 802,388 kg. (these are not approved for use in humans)
Those sold for animal use but also used in human health totaled a mere 11,101 kg. (flouroaquinolones and daminopyrimidines)
[Source: Letter from FDA to Congresswoman Slaughter dated April 19, 2011]
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The Reality Facts
Off the total weight of antibiotics sold for possible use in animals, 82% of that total is either not approved for use in human medicine (the ionophores and most NIRs for example) or are rarely prescribed for use in human medicine as a poor second or third choice drug (chlor- and oxy-tetracycline)
It is my firm belief that it is the 18% where there is overlap that we should focus our attention and discussions on.
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Top Five Classes of ABX Used in Human Health
1. Penicillin (Augmentin) Kg share = 44.0% 2. Cephalosporins (Keflex) Kg share = 15.1% 3. Sulfa and TMP (Bactrim) Kg share = 14.2% 4. Quinolones (Cipro) Kg share = 9.2% 5. Macrolides (Z-Pak) Kg share =
5.3%
These top five classes represent 88 % of all antibiotics sold for use in human medicine.
Source: Same FDA letter to Slaughter
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0
5
10
15
20
25
30
35
40
45
50
AnimalHuman
82% of the total volume sold for
animals
68% of the total volume sold for
humans
Animal vs. Human Use Little Overlap
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ANIMAL VS. HUMAN USESOME OVERLAP
Yellow—animal salesGreen—human sales
Sulfa Macrolides0
2
4
6
8
10
12
14
16
Series 1Series 2
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Tetracycline
Oxy- and chlortetracycline first used in late 1940s and most bacteria became resistant early
Limited use as a second line drug for Bubonic Plague, Lyme Disease, Rocky Mountain Spotted Fever and Acne
Macrolides (Erythromycin—Z-Pak) would be the drug of choice for the above.
Bacteriostatic, 4 times per day dosing 2 hours before and after meals or dairy (O’Neill story)
Less than 1% of human sales for BT stockpiles
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A Short Staph/Penicillin History
Staphylococcal aureus was discovered in 1880 Penicillin was discovered in 1928 by Fleming and
first mass produced in 1944 for the Army pre-Normandy
By 1950, 40% of hospital isolates of S aureus were Penicillin resistant
By 1960, 80% of S aureus isolates were resistant Methicillin was introduced in 1959 to treat
Penicillin resistant Staph infections MRSA was first reported in 1960 33% of those in this room have S aureus in their
nasal cavities—1.5% have MRSA
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MRSA
For four decades MRSA was only acquired in hospital settings
Beginning around 2000 more ill patients were now treated as outpatients and MRSA became community acquired
Hospital acquired MRSA is down 54% from 2005-2011 (CDC. JAMA 11/25/13 Vol 173, No. 21)
Community acquired is down 27.7%2005-2011 80% of MRSA cases involve health care facilities CDC: “Community acquired MRSA is primarily
limited to skin infections with no long term care implications.
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MRSA in animals
Why not? We share an environmental ecosystem, but do they give it to us, or did we give it to them?
Even if some are colonized by working with animals, no one in the US has ever been known to become ill with livestock-acquired MRSA
75% of all new human infections are zoonotic, coming from animal contact. Infections like monkey pox, West Nile Virus, Hanta virus, Avian Influenza, SARS etc.
This is not a new phenomenon!!!!
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Plain Old Penicillin
Some say Strep Throat will once again kill children because of the use of penicillin in animals, yet plain old penicillin is still the drug of choice for Strep Throat, Syphillis and many other gram positive infections.
Resistance has not developed in these bacteria for reasons unknown to our top scientists despite penicillin being used for over 60 years to treat these infections
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Definition: Superbugs
Any bacteria with resistance to multiple antibiotics leaving limited or no options to treat, such as:
Methicillin Resistant Staphylococcal aureus (MRSA) [Not just Meth, but all B-lactams)
Extremely Drug Resistant Tuberculosis mycobacterium (EDRTB)
Vancomycin Resistant Enterococcus (VRE) [20% of nosocomial infections]
Vancomycin Resistant Staph aureus (VRSA) Clostridium difficile Pseudomonas aeruginosa Carbapenem Resistant Enterobacteriaceae (CRE)
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Superbugs
Most are hospital acquired infections following a surgical procedure.
Vancomycin Resistant Staphylococcal aureus (VRSA) is one of the newest, and the resistance is not because of overuse or misuse in animal or human health that many suggest are the primary reasons for antibiotic resistance.
Vancomycin is only used for life threatening infections and always under the direct guidance of a health care professional yet Staph has once again found a way to protect itself.
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Superbugs
According to the Infectious Disease Society of America, the prior list of superbugs had no food-borne or animal connections.
Others, like Multi-Drug Resistant (MDR) Salmonella, may have connections with food and antibiotic use in animals but these are not necessarily superbugs.
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New Reports on Antibiotic Resistance in September
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UK Five Year Antimicrobial Resistance Strategy Sept. 2013 https://www.gov.uk/government/uploads/
system/uploads/attachment_data/file/244058/20130902_UK_AMR_strategy.pdf
Page 8 Introduction “Increasing scientific evidence suggests
that the clinical issues with antimicrobial resistance that we face in human medicine are primarily the result of antibiotic use in people, rather than the use of antibiotics in animals.”
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US Centers for Disease Control Report on Antibiotic Resistance From the CDC’s September, 2013, press
release accompanying the over 100 page report:
“The use of antibiotics is the single most important factor leading to antibiotic resistance around the world. Antibiotics are among the most commonly prescribed drugs used in human medicine. However, up to half of the antibiotic use in humans…. is unnecessary or inappropriate.”
3-4 pages on use of antibiotics in animals www.cdc.gov/drugresistance/threat-report-20
13/pdf/ar-threats-2013-508.pdf
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National Institute for Animal Agriculture
Third Annual Symposium on Antibiotic use in Animals Raised for Food
Kansas City, KS, November 12-14, 2013
Actual video and transcripts: www.animalagriculture.org/Solutions/Smposia/2013_antibiotics/proceedings.html
White Paper: www.animalagriculture.org
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The Numbers Game
“Debate over the amounts sold or used is diversionary: it is not the main issue in the public health debate about antibiotic resistance” (Ron Phillips, Animal Health Institute)
“The issue shouldn’t be the amount or
frequency of antimicrobials used. The real issues are: 1. the judicious use of antimicrobials and 2. is there a significant impact on human health ?” (AVMA)
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Can We Talk?
The antibiotic use issue is best approached from a systems-based approach that strives to close gaps of misunderstanding and avoid implementing impetuous remedies that prove to be meaningless solutions while often times producing undesirable outcomes.
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This should not be another Pink Slime fiasco
Perception: The Animal Agriculture industry is being painted as irresponsible and inappropriate users of massive amounts of antibiotics in healthy animals, when in fact:
Reality: The current uses and doses of antibiotics in animals have been approved by the FDA as appropriate.
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CLOSING THOUGHT
Statement from Ron DeHaven, DVM and Executive Vice President and CEO of the American Veterinary Medical Association:
“When policy regarding the judicious and safe use of antibiotics in food producing animals is being debated and formulated, it should be based on biological science, not political science.”
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Reality: This is a Global Issue
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? Questions ?