20.11.2014 Views

IFT Review of Antibiotic Resistance - Federation of Animal Science ...

IFT Review of Antibiotic Resistance - Federation of Animal Science ...

IFT Review of Antibiotic Resistance - Federation of Animal Science ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Antimicrobial<br />

<strong>Resistance</strong>:<br />

Implications for the Food System<br />

An Expert Report<br />

<strong>IFT</strong> Foundation<br />

Sponsored by the


Intellectual Contributors<br />

Frank Busta<br />

University <strong>of</strong> Minnesota<br />

Bruce Cords<br />

Ecolab<br />

Scott Hurd<br />

Director, WHO Collaborating Center<br />

for Risk Assessment and Hazard<br />

Identification in Foods <strong>of</strong> <strong>Animal</strong> Origin<br />

Richard Isaacson<br />

University <strong>of</strong> Minnesota<br />

Michael Davidson<br />

University <strong>of</strong> Tennessee<br />

Karl Matthews<br />

Rutgers University<br />

Michael Doyle, Panel Chair<br />

University it <strong>of</strong> Georgia<br />

John Maurer<br />

University it <strong>of</strong> Georgia<br />

John Hawke<br />

Louisiana State University<br />

Jianghong Meng<br />

University <strong>of</strong> Maryland


Intellectual Contributors<br />

Thomas Montville<br />

Rutgers University<br />

Anne Vidaver<br />

University <strong>of</strong> Nebraska<br />

Thomas Shryock<br />

Elanco <strong>Animal</strong> Health<br />

Lyle Vogel<br />

American Veterinary Medical Association<br />

John S<strong>of</strong>os<br />

Colorado State University<br />

<strong>IFT</strong> Staff: Jennifer McEntire<br />

Rosetta Newsome<br />

Fred Shank


Incidence <strong>of</strong> Foo<br />

dborne Illness in<br />

United States<br />

● U.S. Centers for Disease Control and Prevention<br />

estimates 76 million cases <strong>of</strong> foodborne illness<br />

annually<br />

▲ Includes 325,000 hospitalizations and 5,000<br />

deaths<br />

P. S. Mead et al. 5:607 (1999)


Leading Bacterio<br />

logical Causes <strong>of</strong><br />

Enteric Foodborne Illness in USA<br />

●<br />

Campylobacter jejuni –estimated 2.4 million cases/yr<br />

● Salmonella sp. – estimated 1. 4 million cases/yr<br />

● E. coli O157:H7 – estimated 73,000 cases/yr<br />

P. Mead et al. Emerging Infect.<br />

Dis. 5:607-625 625 (1999)


Principal Source<br />

es <strong>of</strong> Foodborne<br />

Pathogens<br />

● <strong>Animal</strong>s used in food production<br />

▲ Cattle – E. coli O157:H7 (EHEC), Salmonella,<br />

Campylobacter<br />

▲ Swine – Salmonella, Campylobacter<br />

▲ Poultry – Campylobacter, Salmonella


Antimicrobials<br />

Used in Food<br />

Production and Food Processing<br />

● Important to reduce and control foodborne<br />

pathogens in animals use<br />

ed for foods and the further<br />

processing <strong>of</strong> animals


<strong>Antibiotic</strong> Applications<br />

●<br />

Antimicrobials used during food production and manufacturing to improve the efficiency <strong>of</strong><br />

the system, and increase the safety and quality <strong>of</strong> the product<br />

▲ <strong>Animal</strong> Husbandry in USA – <strong>Antibiotic</strong>s<br />

♦ Poultry – 8.4 billion broilers and 26<br />

64 million turkeys (2004)<br />

■ 10,000 – 20,000 broilers per house and 5,000 – 10,000 turkeys per group<br />

♦ Swine – 103 million hogs slaughtered for food (2005)<br />

■ >75% <strong>of</strong> swine grown in operations with >5000 head<br />

♦ Beef Cattle – 37 million head slaughtered (2004)<br />

■ Ca. 83% <strong>of</strong> feedlots use ≥1 antibiotic for disease prophylaxis or to increase<br />

feed efficiency<br />

♦ Dairy Cattle – 9.12 million head in milk production (2001)<br />

■ <strong>Antibiotic</strong>s used to treat mastitis<br />

♦ Veal Calves – raised individually in<br />

stalls until 16-18 weeks <strong>of</strong> age<br />

■ <strong>Antibiotic</strong>s used to treat respiratory and gastrointestinal diseases and for<br />

disease prophylaxis<br />

<strong>Antibiotic</strong> uses:<br />

Therapeutic, including subtherapeutic to prevent disease or control pathogens (ca.<br />

95% <strong>of</strong> antibiotic usage)<br />

Non-therapeutic uses: Promote growth rate and feed efficiency


<strong>Antibiotic</strong> Applications<br />

▲ Aquaculture – <strong>Antibiotic</strong>s only used in U.S. to treat<br />

disease; not for growth promotion<br />

♦ 49 million pounds <strong>of</strong> salmon, 20 million pounds <strong>of</strong><br />

tilapia, 10 million pounds <strong>of</strong> striped bass (USA, 2000),<br />

630 million pounds <strong>of</strong> catfish, 46 million pounds <strong>of</strong><br />

trout (USA, 2003)<br />

♦ Catfish grown in 10- to 20-acre ponds with 10,000<br />

fish/acre<br />

▲ Plant Agriculture – <strong>Antibiotic</strong>s to control bacterial<br />

diseases and fungicides to<br />

control fungi<br />

♦ Fruit trees account for most <strong>of</strong> antibiotic i use on plants<br />

♦ Most antimicrobials used on plants are fungicides<br />

▲ Human Medicine – Antibio<br />

otics used to treat disease and<br />

prevent infection


<strong>Antibiotic</strong> Usage Data<br />

●<br />

Exact amount <strong>of</strong> antibiotics used in animal production is<br />

unknown but likely comparabl<br />

e to amount used in human<br />

medicine<br />

▲ <strong>Animal</strong>s – est. 21.7 million<br />

use; 2004)<br />

pounds (95% for therapeutic<br />

▲ Aquaculture – 65,000 pounds annually (2003)<br />

▲ Plants – 52 million pounds<br />

<strong>of</strong> fungicides id and 44,000<br />

pounds <strong>of</strong> antibiotics (2004)<br />

▲ Human – unknown (est. 4.<br />

5 million to 32 million pounds<br />

depending on organizationn providing estimates)


Monitoring <strong>Antibiotic</strong> <strong>Resistance</strong><br />

●<br />

National Antimicrobial <strong>Resistance</strong> Monitoring System for<br />

Enteric Bacteria (NARMS)<br />

▲ U.S. antibiotic resistance monitoring system for foodrelated<br />

bacteria – CDC, FDA, USDA<br />

▲ Purpose – monitor change<br />

es in susceptibilities <strong>of</strong> zoonotic<br />

pathogens in humans, animals and animal products<br />

♦ Bacterial isolates from human and animal clinical<br />

specimens, healthy farm<br />

animals, and raw foods <strong>of</strong><br />

animal origin<br />

■ Salmonella, E. coli,<br />

Campylobacter, Enterococcus<br />

♦ Determine Minimal Inhibitory Concentration (MIC) <strong>of</strong><br />

important antimicrobial classes used in human and<br />

animal medicine


Trends in Percentage <strong>of</strong> <strong>Antibiotic</strong>-Resistant Salmonella Newport<br />

Isolated from Human Cases, a <strong>Animal</strong>s and <strong>Animal</strong> Products, b and<br />

Retail Meats c in the United States<br />

<strong>Antibiotic</strong> <strong>Resistance</strong><br />

Humans<br />

1996 2001<br />

None <strong>of</strong> 14 agents 82 65<br />

5 or more agents 6 27<br />

8 or more agents 4 25<br />

MDR-AmpC 0 25<br />

Cipr<strong>of</strong>loxacin 0<br />

Cefti<strong>of</strong>ur 4 27<br />

Ampicillin 6 29<br />

Tetracycline 8 30<br />

Trimethoprim-Sulfa 4 2<br />

a<br />

CDC NARMS<br />

b<br />

USDA NARMS<br />

c<br />

FDA NARMS<br />

<strong>Animal</strong>s & Products<br />

Retail<br />

Meats<br />

2002 2000 2002 2003 2002<br />

73<br />

23<br />

22<br />

22<br />

0 0 0 0 0<br />

22 75 78 74 62<br />

24 76 80 74 62<br />

25 78 83 77 62<br />

4 19 2 0


Changes in the incidence <strong>of</strong> foodborne illness, and corresponding changes in<br />

prevalence <strong>of</strong> antibiotic-resistant foodborne pathogens in U.S.<br />

Year(s)<br />

Organism<br />

Case rate<br />

(per 100,000)<br />

Relative<br />

Decrease<br />

or increase<br />

%<br />

Resistant<br />

Case rate<br />

(per 100,000)<br />

Relative<br />

decrease<br />

or increase<br />

1996-98 Salmonella 15.9<br />

31% (2 or more 4.9<br />

antibiotics, 1996)<br />

2004 14.7 8% decrease 16% (2 or more 2.4 51%<br />

antibiotics, 2002)<br />

decrease<br />

1996-98 Salmonella<br />

4.9<br />

34% (ACSSuT, 1996) 1.7<br />

Typhimurium<br />

2004 29 2.9 41% decr<br />

rease 21% (ACSSuT, 2002) 06 0.6 65%<br />

decrease<br />

1996-98 Salmonella<br />

1.2<br />

8% (2 or more<br />

0.1<br />

Newport<br />

antibiotics, 1996)<br />

2004 1.7 41% increase<br />

25% (2 or more 0.4 300%<br />

antibiotics, 2002)<br />

increase<br />

1996-98 Campylobacter 18.7<br />

13% (cipr<strong>of</strong>loxacin 2.4<br />

resistance, 1997)<br />

2004 12.9 31% decrease<br />

20% (cipr<strong>of</strong>loxacin 2.6 8% increase<br />

resistance, 2002)


Relative rates compared with 1996-1998 baseline period <strong>of</strong> laboratory-<br />

diagnosed d cases <strong>of</strong> infection with th<br />

he six most commonly isolated<br />

Salmonella serotypes, by year – Foodborne Disease Active Surveillance<br />

Network, United States, 1996-2006


Risk Factors for Human Infection by<br />

<strong>Antibiotic</strong>-Resistant Foodborne Pathogens<br />

●<br />

●<br />

Very few data regarding food animal-to-human transfer <strong>of</strong><br />

antimicrobial resistance to indicate more frequent or severe<br />

infections or increased morbidi<br />

ty and mortality<br />

Antimicrobial therapy is not necessary for recovery from most<br />

cases <strong>of</strong> foodborne illness<br />

▲ Most foodborne pathogens<br />

self-limiting limiting symptoms that<br />

typically cause mild to moderate<br />

resolve without treatment


Risk Factors for Human Infection by<br />

<strong>Antibiotic</strong>-Resistant Foodborne Pathogens<br />

●<br />

Most frequently identified risk factor for infection with antibiotic-resistant<br />

bacteria is prior exposure to antibiotics, including taking antibiotics for<br />

reasons other than foodborne illnesses<br />

▲<br />

▲<br />

Other risk factors are essentially the same as those for acquiring<br />

infections with antibiotic susceptible pathogens, which include:<br />

♦ Age (less than 5 or greater th<br />

han 50)<br />

♦ Pregnancy<br />

♦ Immunosuppression (chemotherapy, HIV infection, other illness)<br />

♦ Reduced liver or kidney funct<br />

tion<br />

Reasonable assumption the risk <strong>of</strong> treatment failure in immuno-<br />

microbial infections<br />

would be elevated<br />

compromised individuals with antibiotic-resistant


●<br />

Impact <strong>of</strong> <strong>Antibiotic</strong><br />

cUse Use, Non-Use, and<br />

<strong>Resistance</strong><br />

Human Health<br />

▲ Loss <strong>of</strong> treatment options or treatment failure for individuals seriously ill<br />

from antibiotic-resistant foodborne pathogen<br />

♦ Estimated that 40 – 50% <strong>of</strong> ho<br />

spitalized patients with salmonellosis<br />

are treated with antibiotics<br />

▲ Longer duration <strong>of</strong> illness when infected with antibiotic-resistant pathogen<br />

♦ Patients infected with fluoroqu<br />

inolone-resistant C. jejuni j had longer<br />

duration <strong>of</strong> illness than patients<br />

infected with fluoroquinolone-sensitive<br />

strains<br />

▲ Individuals infected with MDR microorganisms more likely to be<br />

hospitalized than those infected wi<br />

th antimicrobial-sensitive strains<br />

▲ Denmark study found death rates from MDR or quinolone-resistant cases<br />

<strong>of</strong> salmonellosis were 5 to 10 times<br />

greater than general population<br />

▲ In general, e there e is increased seve<br />

erity <strong>of</strong> illness associated ated with infections<br />

caused by antimicrobial-resistant pathogens


Impact <strong>of</strong> Antimicrobi<br />

ial Use, Non-Use, and<br />

<strong>Resistance</strong><br />

●<br />

Trade<br />

▲<br />

▲<br />

Difference among big U.S. trading partners (e.g., Canada and South<br />

Korea) and its competitors (e.g.,<br />

EU) in acceptable use <strong>of</strong> specific<br />

antibiotics for growth promotion<br />

♦ EU prohibits in feed for growth promotion use <strong>of</strong> antibiotics that are<br />

used in human medicine<br />

GAO reports to date antimicrobial resistance <strong>of</strong> microbes associated<br />

with antibiotic use in animals has<br />

not significantly affected U.S. trade in<br />

meat products<br />

♦ GAO indicates this issue may<br />

be a factor in the future, such as in<br />

EU which is phasing out by 2006 use <strong>of</strong> all antibiotics for growth<br />

promotion


Impact <strong>of</strong> Antimicrobi<br />

ial Use, Non-Use, and<br />

<strong>Resistance</strong><br />

●<br />

Economic<br />

▲<br />

▲<br />

A ban or partial ban on antibiotics<br />

in food animal production would<br />

increase costs to producers, decr<br />

rease production, and increase retail<br />

prices to consumers<br />

♦ Example, GAO (2004) estimated the elimination <strong>of</strong> antibiotic use in<br />

pork production would increa<br />

ase producer costs from $2.76 to $6.05<br />

per animal; increase consumer costs for pork from $180 million to<br />

$700 million per year<br />

■ Greatest financial a impact<br />

at producer level<br />

e<br />

Economic assessment <strong>of</strong> consequences <strong>of</strong> use in human medicine are<br />

essentially nonexistent


Impact <strong>of</strong> Antimicrobi<br />

ial Use, Non-Use, and<br />

<strong>Resistance</strong><br />

●<br />

Environmental<br />

▲<br />

▲<br />

Risks to human, animal or environmental health from the direct impact<br />

<strong>of</strong> antimicrobials on bacteria in aq<br />

quatic and terrestrial environments<br />

appear low<br />

♦ However, antimicrobial agents in ecosystems can lead to drastic<br />

alterations in biodiversity <strong>of</strong> affected ecosystems, reduction <strong>of</strong><br />

microorganisms susceptible to agents, and development <strong>of</strong><br />

antimicrobial resistance<br />

Overall, general e lack <strong>of</strong> knowledg<br />

ge and agreement e about the frequency<br />

and extent <strong>of</strong> occurrence, fate, and effects associated with<br />

antimicrobials entering the environment. It is difficult to assess<br />

environmental impact <strong>of</strong> use <strong>of</strong> antimicrobials.


Management <strong>of</strong> Antim<br />

microbials to Control<br />

<strong>Resistance</strong><br />

●<br />

Responsible Use<br />

▲<br />

▲<br />

Guidelines exist for responsible use <strong>of</strong> antibiotics in veterinary and<br />

human medicine<br />

♦ Not merely reduced use because drugs <strong>of</strong>fer valuable benefits<br />

when used appropriately<br />

■ Involves prescribing antim<br />

microbial therapy only when it is<br />

beneficial to the patient, targets therapy to desired pathogens<br />

and use <strong>of</strong> appropriate drug, and confines treatment duration<br />

Intent is to promote appropriate use <strong>of</strong> antibiotics, maximizing<br />

efficiency and minimizing resistance development


Risk Analysis for Regulatory Decisions<br />

on <strong>Antibiotic</strong> Usage<br />

●<br />

Regulatory environment in US<br />

SA is geared toward protecting<br />

ti<br />

the public from additional risk without consideration <strong>of</strong><br />

benefits, hence emphasis on risk assessment<br />

▲ Not possible for regulatory<br />

agencies to judge between the<br />

benefits <strong>of</strong> antibiotic use for livestock and risks to the<br />

public<br />

♦ Therefore, regulators must reject any practice that<br />

appears to produce an apparent risk unless a<br />

demonstrated higher risk would appear upon rejection<br />

<strong>of</strong> the practice


Risk Analysis for Regulatory Decisions<br />

on <strong>Antibiotic</strong> Usage<br />

▲ Example, evidence that t there are significant ifi human health<br />

benefits from antibiotic use<br />

to prevent food animal disease<br />

♦ Subclinical disease infl<br />

uences levels <strong>of</strong> Salmonella and<br />

Campylobacter contamination <strong>of</strong> poultry carcasses<br />

■ Therefore, the risk <strong>of</strong> antibiotic use to control<br />

subclinical disease more than compensates for the<br />

human health benefit<br />

−Estimate that at<br />

least 40,000000 illness-days per<br />

year are prevented by continued use <strong>of</strong><br />

virginiamycin to reduce bacterial illnesses in<br />

chicken flocks


Risk Analysis for Regulatory Decisions on<br />

Antimicrobial i Us<br />

sage: Example <strong>of</strong><br />

Unintended Consequences?<br />

●<br />

Risk management action in Europe to eliminate use <strong>of</strong><br />

antibiotics for feed efficiency and growth promotion may have<br />

resulted in increased intestinal disease in animals and<br />

concomitant use <strong>of</strong> more therapeutic antibiotics with resultant<br />

increase in resistance<br />

▲ <strong>Resistance</strong> among some pathogens (tet R S. Typhimurium,<br />

amp R S. Typhimurium, tet R C. jejuni, cry R C. jejuni, amp R E.<br />

coli) have increased in Europe


Risk Analysis for Regulatory Decisions on<br />

Antimicrobial i Us<br />

sage: Example <strong>of</strong><br />

Unintended Consequences?<br />

▲ Example, Denmark banned in 1998 use <strong>of</strong> antibiotics for<br />

growth promotion <strong>of</strong> animals<br />

♦ Total use <strong>of</strong> antibiotics in<br />

animals in Denmark<br />

decreased 30% between<br />

1997 (before ban) and 2004,<br />

there was a 41% increase in therapeutic ti uses between<br />

1999 (after ban) and 2004<br />

■ Between ee 1999-2004,<br />

tet R and amp R <strong>of</strong> S.<br />

Typhimurium from pigs increased, from chickens<br />

increased from 0% in<br />

1997 to 17% in 2004 and from<br />

ill humans increased<br />

from 18% to 46%


Risk Analysis for Reg<br />

gulatory Decisions on<br />

Antimicrobial Usage<br />

●<br />

EU banned antibiotic use in feed for growth promotion on the<br />

basis <strong>of</strong> the precautionary principle which is employed when<br />

scientific information is insuffici<br />

ient, inconclusive or uncertain<br />

▲ Sweeping risk management<br />

measures that are proposed<br />

for a certain classification <strong>of</strong><br />

use (e.g., growth promotion)<br />

can be draconian and without predictable results<br />

▲ Analysis would best be carried out on a case-by-case basis<br />

and driven by product-spec<br />

ific, science-based risk<br />

assessments


Risk Analysis – Expe<br />

ert Panel Conclusion<br />

●<br />

Expert Panel concludes that thorough risk assessments<br />

should be used to guide selection <strong>of</strong> risk management actions<br />

so that unintended consequenc<br />

ces are minimized


Conclusions<br />

●<br />

●<br />

<strong>Antibiotic</strong>s are integral to food production, providing for good<br />

physical condition <strong>of</strong> crops and<br />

good health <strong>of</strong> food animals<br />

<strong>Antibiotic</strong>s are used to treat, prevent and control disease<br />

among food animals and also improve feed utilization<br />

▲ Despite the utility <strong>of</strong> antibiotics in agriculture, the trend is to<br />

reduce usage because <strong>of</strong> use for any purpose selects for<br />

resistance


Conclusions<br />

●<br />

<strong>Antibiotic</strong> resistance among foodborne pathogens may create<br />

an increased burden to human<br />

health in the following ways:<br />

1. Resistant t pathogens contam<br />

minating food animals have the<br />

potential to reach humans<br />

2. Human use <strong>of</strong> antibiotics may increase the risk <strong>of</strong> acquiring<br />

an infection with an antimicrobial resistant pathogen<br />

3. Human infection with a resistant microbe may limit illness<br />

treatment t t options<br />

4. <strong>Antibiotic</strong>-resistant foodborne pathogens may develop<br />

increased virulence


Conclusions<br />

●<br />

●<br />

●<br />

<strong>Antibiotic</strong>-resistant intestinal bacteria may be present in food<br />

animals, regardless <strong>of</strong> exposure <strong>of</strong> the animals to an antibiotic<br />

Interventions that effectively reduce the prevalence <strong>of</strong><br />

foodborne pathogens also reduce the prevalence <strong>of</strong> those that<br />

are resistant t to antibiotics<br />

Food scientists can influence preventing the spread <strong>of</strong><br />

antibiotic-resistant (and sensitive) foodborne pathogens by<br />

preventing them from entering the food supply and, if present,<br />

inactivating them or preventing<br />

their growth


Conclusions<br />

●<br />

Selective pressure for the development <strong>of</strong> antimicrobial<br />

resistance occurs in the food system from production to<br />

processing, and in human med<br />

dical use<br />

▲ Given the different resistance mechanisms, conditions<br />

selecting for resistance, and<br />

dissemination patterns <strong>of</strong><br />

resistant microorganism, a single approach to address<br />

the resistance issue to maximize the benefit <strong>of</strong><br />

antimicrobials for society<br />

is not possible


Conclusions<br />

●<br />

Qualitative and quantitative risk<br />

assessments are being used<br />

to determine transfer <strong>of</strong> antibiotic resistance through the food<br />

chain resulting in human health<br />

h consequences<br />

▲ For many antibiotics such as tylosin, tilmocosin, and<br />

virginiamycin used in food animals, the estimated risk to<br />

human health is small<br />

▲ However, fluoroquinolone used to treat poultry disease<br />

through water was deemed<br />

by FDA as an unacceptable<br />

risk to human health and was withdrawn


Conclusions<br />

●<br />

●<br />

●<br />

<strong>Antibiotic</strong>-resistant intestinal bacteria may be present in food<br />

animals, regardless <strong>of</strong> exposure <strong>of</strong> the animals to an antibiotic<br />

Interventions that effectively reduce the prevalence <strong>of</strong><br />

foodborne pathogens also reduce the prevalence <strong>of</strong> those that<br />

are resistant t to antibiotics<br />

Food scientists can influence preventing the spread <strong>of</strong><br />

antibiotic-resistant (and sensitive) foodborne pathogens by<br />

preventing them from entering the food supply and, if present,<br />

inactivating them or preventing<br />

their growth


Conclusions<br />

●<br />

Risk management strategies to<br />

minimize and contain antibiotic-<br />

in place all along the food<br />

chain, but can be improved<br />

resistant foodborne bacteria are<br />

▲ The strategies implemented<br />

include use <strong>of</strong> antibiotic<br />

alternatives, implementation<br />

n <strong>of</strong> judicious or prudent<br />

antibiotic use guidelines, and implementation <strong>of</strong> national<br />

resistance monitoring programs


Conclusions<br />

●<br />

Regulatory targeting ti <strong>of</strong> specific antibi<br />

iotic-resistant i t t foodborne pathogens<br />

may not be the most successful or cost-effective means to reduce overall<br />

foodborne illness<br />

▲<br />

▲<br />

▲<br />

A HACCP approach applied throughout the food chain is considered<br />

d<br />

the most effective measure to controlling foodborne pathogens and<br />

thereby reducing foodborne illnesses<br />

Most interventions, ti critical contro<br />

l points to kill or reduce foodborne<br />

pathogens are equally effective in<br />

controlling microbes regardless <strong>of</strong><br />

their resistance to antibiotics<br />

Applying interventions ti to critical foodborne pathogens in general rather<br />

than focusing on antibiotic-resistant strains specifically would have the<br />

greatest impact in reducing foodborne illnesses


Specific Recommendations<br />

●<br />

The <strong>IFT</strong> Expert Panel concluded the following areas warrant attention or<br />

investigation:<br />

▲<br />

▲<br />

▲<br />

The public health benefits as wel<br />

l as the risks <strong>of</strong> losing the efficacy <strong>of</strong><br />

existing and future antimicrobials must be considered<br />

The public health impact <strong>of</strong> antimicrobial resistance should be<br />

determined on the basis <strong>of</strong> risk as<br />

ssessment, and resistance should be<br />

considered on the basis <strong>of</strong> an individual microorganism exposed to a<br />

specific agent under a specific condition <strong>of</strong> use<br />

Risk management age e strategies es sho<br />

uld be guided by the results <strong>of</strong> risk<br />

assessments


Specific Recommendations<br />

●<br />

●<br />

Prudent use <strong>of</strong> antimicrobials should be practiced to limit<br />

resistance selection and maintain maximal benefit. Prudent<br />

use does not necessarily corre<br />

late with reduced use; an<br />

unknown risk <strong>of</strong> maintaining use may be less than an equally<br />

unknown risk <strong>of</strong> reducing use<br />

Prudent use guidelines for antibiotics should be further<br />

developed


Specific Recommendations<br />

●<br />

●<br />

●<br />

Effective alternatives ti to antibiot<br />

tics should be explored<br />

Surveillance program and food attribution models should be<br />

explored as means for measuring the effectiveness <strong>of</strong> the food<br />

industry’s microbiological interventions<br />

The relationship <strong>of</strong> the use <strong>of</strong> specific antibiotics in food animal<br />

husbandry to resistance selection rates among major<br />

foodborne bacteria at slaughter<br />

should be determined and<br />

compared between farms where antibiotics are used and<br />

farms where antibiotics are not<br />

used


Specific Recommendations<br />

●<br />

Although it needs to be confirmed, information available to<br />

date indicates that validated microbial interventions used in<br />

food processing and in the hou<br />

use are equally effective for<br />

antimicrobial-susceptible and resistant microorganisms and<br />

should be used to prevent dissemination <strong>of</strong> foodborne<br />

pathogens


Web Site Address for Complete Report<br />

Comprehensive <strong>Review</strong>s in Food<br />

<strong>Science</strong> and Food Safety<br />

http://members.ift.org/<strong>IFT</strong>/Pubs/CRFSFS/


MPD’s Additional Perspective<br />

● ca. 15% <strong>of</strong> foods consume<br />

ed in U.S. is imported<br />

▲ 83% <strong>of</strong> fresh and frozen<br />

seafood and fish<br />

♦ Most shrimp is aqua<br />

cultured in Southeast Asia<br />

▲ 45% <strong>of</strong> fresh fruits<br />

▲ 16% <strong>of</strong> fresh vegetables<br />

● Indiscriminant use <strong>of</strong> antibiotics in food production in<br />

some developing countries<br />

● Bottom line: Imported foods from some countries are<br />

likely to be important sourc<br />

ces <strong>of</strong> MDR microbes


●<br />

MDR Salmonella Paratyphi B var. Java<br />

Outbreak<br />

in Cattle<br />

MDR S. Java outbreak occurredincattleintheUnited<br />

the Kingdom<br />

▲ MDR S. Java associated with tropical fish from Thailand<br />

put in cattle drinking water<br />

tanks to control algae<br />

♦ Thailand aquaculture does not normally apply<br />

antibiotics directly to ponds<br />

■ Fish are fed chicken<br />

manure and chickens are fed<br />

antibiotics<br />

−<strong>Antibiotic</strong>s induc<br />

cing drug resistance likely<br />

present in chicken feces fed to fish<br />

John Threlfall, Society for General Microbiology Annual<br />

Meeting, Edinburgh, Scotland, April 2005


Food Safety Trends – Food Imports<br />

● Increased importation <strong>of</strong> foods and food<br />

ingredients<br />

▲Includes from countries having production<br />

and processing cond<br />

ditions below U.S.<br />

standards


China as Example<br />

<strong>of</strong> Questionable<br />

● Issues<br />

Food and Food Ingredient Source<br />

▲ Farmers rely on heavy use <strong>of</strong> chemicals to deal<br />

with pest pressures, and<br />

antibiotics are widely used<br />

to control disease in livestock, poultry and<br />

aquaculture<br />

♦ Use many highly toxic pesticides, including<br />

some that are banned in U.S.<br />

♦ Farm chemicals are sometimes mislabeled and<br />

inappropriately used<br />

http://www.ers.usda.gov/AmberWaves/November06/Features/FoodSafety.htm


China as Example<br />

<strong>of</strong> Questionable<br />

Food and Food Ingredient Source<br />

♦ Some farmers have<br />

little understanding <strong>of</strong><br />

correct chemical use, resulting in excessive<br />

residues in harvested product<br />

♦ Industrialization and<br />

lax environmental<br />

controls contribute<br />

t<br />

to heavy metal<br />

contamination <strong>of</strong> foods


China as Example<br />

<strong>of</strong> Questionable<br />

Food and Food Ingredient Source<br />

▲ Untreated human and animal wastes are applied<br />

to fields directly and through irrigation water<br />

♦ Results in food contamination ti with Salmonella<br />

ll<br />

and harmful microorganisms


Examples <strong>of</strong> U.S. FDA<br />

Detentions <strong>of</strong> Food and<br />

Food Ingredients from China (February 2007)<br />

Food/Ingredient<br />

Contaminant<br />

Dried Pepper Powder<br />

Ginseng Extract Powder<br />

IQF Pea Pods<br />

IQF Soybeans<br />

Frozen Grilled Eel<br />

IQF Breaded Shrimp<br />

Salmonella<br />

Pesticides<br />

Pesticides<br />

Pesticides<br />

Veterinary Drugs<br />

Veterinary Drugs


Examples <strong>of</strong> U.S. FDA<br />

Detentions <strong>of</strong> Food and<br />

Food Ingredients from China (March 2007)<br />

Food/Ingredient<br />

Contaminant<br />

Fresh Ginger<br />

Ground Chili Powder<br />

Ginseng<br />

Mandarin Oranges<br />

Red Melon Seeds<br />

Pumpkin Seeds<br />

Pesticides<br />

Salmonella<br />

Pesticides<br />

Pesticides<br />

Aflatoxin<br />

Salmonella


Examples <strong>of</strong> U.S. FDA Detentions <strong>of</strong> Food and<br />

Food Ingredients from<br />

India (March 2007)<br />

Food/Ingredient<br />

Contaminant<br />

Turmeric Powder<br />

Salmonella<br />

Creamy Peanut Butter<br />

Pesticides, Aflatoxin<br />

“Richfield” Creamy Peanut Butter<br />

Pesticides, id Aflatoxin<br />

Pista Burfee Fried Snack Food<br />

Salmonella<br />

All In One Snack Food<br />

Salmonella<br />

Red Chili Powder<br />

Salmonella<br />

Chili Powder<br />

Salmonella<br />

Coriander Powder<br />

Salmonella<br />

Spices – Cumin Whole<br />

Salmonella<br />

Black Pepper<br />

Salmonella<br />

ll<br />

Sesame Seeds<br />

Pesticides


Country <strong>of</strong> origin <strong>of</strong> spices imported by the United States,<br />

by weight, for fiscal year 2003<br />

Nation<br />

China<br />

Honduras<br />

Mexico<br />

Lebanon<br />

Peru<br />

India<br />

Chile<br />

Spain<br />

Morocco<br />

Argentina<br />

V. Vij et al. 2006. J. Food Protect. 69<br />

9:233-237<br />

237<br />

Amt (10 9 kg)<br />

237.5<br />

20.9<br />

11.0<br />

3.3<br />

1.3<br />

10 1.0<br />

0.73<br />

0.34<br />

0.32<br />

0.26


Do Not Rely on Federal or State<br />

Food/Ingredient Inspection to Detect<br />

Harmful Microbes or Chemicals<br />

● FDA samples and tests less than 1% <strong>of</strong> food<br />

imports under its jurisdict<br />

tion<br />

● USDA inspects only ca. 20% <strong>of</strong> meat and poultry<br />

imports<br />

● Wheat gluten contaminated with melamine from<br />

China used in pet food<br />

▲ Not originally detectedd by FDA


Impact <strong>of</strong> Wheat Gluten<br />

Incident on Menu Foods<br />

Dr. Doyle,<br />

I recently saw a video on MSN <strong>of</strong> an interview you did on food<br />

safety. I want to thank you for your accuracy and clear<br />

information about the adulterated Chinese wheat gluten that<br />

has been responsible for the several pet food recalls over the<br />

last 3 weeks.<br />

I am a UGA graduate (BSA 77, MS 79) and am Executive Vice<br />

President <strong>of</strong> Menu Foods, whichh you correctly referenced as<br />

the first company to identify the<br />

health risk and initiate the<br />

recall. So much <strong>of</strong> the press has been negative and more<br />

<strong>of</strong>ten than not, inaccurate. It was great to see someone who<br />

got it right!


Impact <strong>of</strong> Wheat Gluten<br />

Incident on Menu Foods<br />

For our efforts in coming forward with the facts we are<br />

looking at $40 million + in dire<br />

ect cost, more than 40 class<br />

action law suits (so far) and a possible congressional<br />

committee hearing. Still we know we did the right thing.<br />

Again, thank you for your clear, pr<strong>of</strong>essional portrayal <strong>of</strong> the<br />

situation with food safety and imported food products.<br />

Randall C. Copeland<br />

Executive Vice President, Sales<br />

and Marketing<br />

Menu Foods

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!