Implications for Foot and Mouth Disease (FMD) Preparedness … · 2019-04-18 · Implications for...
Transcript of Implications for Foot and Mouth Disease (FMD) Preparedness … · 2019-04-18 · Implications for...
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Gay Y. Miller, DVM, Ph.D.
Professor of Epidemiology and Preventive Medicine, University of Illinois
Adjunct Professor, Agricultural and Consumer Economics, University of Illinois
October 19, 2013 USAHA CAEM Meeting
Current Vaccinology Considerations in North
American Foreign Animal Disease Events –
Implications for Foot and Mouth Disease (FMD)
Preparedness and Response
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Summary of what I’ll share with you today:
Vaccination – Basic considerations
Aspects of FMD – Where are we in vaccination?
Newer literature - What does it tell us?
Implications - Preparedness and Response
Current Vaccinology Considerations in North
American Foreign Animal Disease Events –
Implications for Foot and Mouth Disease (FMD)
Preparedness and Response
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“… It’s importance to mankind is confirmed by the
fact that FMD virus (FMDV) was the first animal virus
discovered…”
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“… vaccines are very useful as part of an eradication
campaign in countries where FMDV is enzootic…
these vaccines are not ideally suited to control
outbreaks in disease-free countries… need for new
vaccines…”
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Key considerations for
vaccines
USDA for emergency use vaccines is to administer
high quality, high potency (6PD50) vaccines which
provide a wider spectrum of immunity and also rapid
onset of protection
Vaccines only effective once administered.
We can withdraw from the ‘Bank’ only what we
deposit in the Bank.
A stockpile (the NVS) suggests there is ‘plenty’; we
are not in the land of plenty for the NAFMDVB.
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Key considerations for
vaccines
USDA for emergency use vaccines is to administer
high quality, high potency (6PD50) vaccines which
provide a wider spectrum of immunity and also rapid
onset of protection
Vaccines only effective once administered.
We can withdraw from the ‘Bank’ only what we
deposit in the Bank.
A stockpile (the NVS) suggests there is ‘plenty’; we
are not in the land of plenty for the NAFMDVB.
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Consider the contrast of the
FMD outbreak in Korea with
the potential of an outbreak
in IA
There is no magic spigot
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ISVEE – The Netherlands, 2012.
Results – application of large
scale emergency vaccination
can diminish the duration and
severity of an FMD outbreak.
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Potential Incident Commanders requesting FMD
vaccination by week of outbreak scenario
Week very or somewhat likely very or somewhat unlikely
1 2 (28%) 5 (71%)
2 4 (57%) 3 (43%)
3 5 (71%) 2 (28%)
4 5 (71%) 2 (28%)
5 6 (86%) 1 (14%)
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What does other recent
research tell us with regard to
FMD vaccination
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What happened in the 2010 FMD outbreak in Japan?
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What happened in the 2010 FMD outbreak in Japan?
Rapid
increase in
numbers of
infected farms
caused
destruction
delays. Over
100 farms
awaiting
destruction by
mid-May
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What happened in the 2010 FMD outbreak in Japan?
Number of
farms
exceeded
abilities to
depopulate.
At that point,
vaccination
was
implemented.
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What happened in the 2010 FMD outbreak in Japan?
• Primary eradication strategy for FMD in Japan is stamping
out and movement restrictions.
• Once emergency vaccination began, all cloven-hoofed
animals were targeted.
• Pigs had higher priority than cattle for vaccination.
• All vaccinated animals were subsequently culled and buried.
• Full government compensation paid for all infected, culled
and vaccinated animals; COST = US$550 million. Other
economic aid also provided.
• Compensation based on market value of the animals.
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What happened in the 2010 FMD outbreak in Japan?
Important issues identified from this outbreak:
• First use of Emergency vaccination for Japan
• Vaccination contributed to disease containment
• Disease control difficult in the most densely populated livestock
areas
• Finding appropriate burial sites for culled animals difficult
• Burial was challenging – needed also to include incineration and
rendering
• Vaccination implemented mainly due to delay from culling known
infected premises
• Decision to adopt emergency vaccination at the appropriate time is
crucial to minimize losses, although this is difficult to judge
• Various factors important in successful disease containment
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Economic impacts of FMD outbreaks high
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Economic impacts of FMD outbreaks high
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Economic impacts of FMD outbreaks high
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Economic impacts of FMD outbreaks high
Direct losses – e.g. production losses, invisible losses (decreased fertility)
Indirect losses – e.g. control costs, loss of markets, movement controls
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FMD Outbreaks in UK & Uruguay: Compelling argument for vaccination
UK Uruguay
Cattle population >10 million >10 million
Sheep population >35 million >12 million
Pig population > 5 million >0.3 million
No. of Infected herds 2,026 2,057
Animals (FMD +) slaughtered 1,227,900 6,937
Total slaughtered 6,600,000 6,937
Duration of outbreak 7 months 4 months
No. of vaccine doses used 0 24 million
Direct cost US$ 4.6 B US$ 13 M
Total economic impact > US$ 10 B <US$ 400 M
33
Slide shared by Alfonso Torres, Cornell University; it is important to
recognize that these economic impacts do not consider Trade embargoes.
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Text
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From Vaccination against FMD I: Epidemiological Consequences, Backer, et al, Prev Vet Med 107 (2012): 27-40.
And From: Vaccination against FMD – Differentiating strategies and their epi and economic consequences. Backer, J, Bergevoiet, R, Hagenaars’ T, et al. LEI report 2009-042.
Economic impacts of control strategies
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All models are wrong.
Some models are useful.
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Implications of FMD for the swine/pork industry:
For the first 11 months of 2012: exports were at
27% of total production! Export value at
$56.12/head.
Scientific Trade Barriers with FMD will likely be
severe
•Sources:
http://www.pork.org/filelibrary/Pork%20Leader/August262010PorkLeader.pdf
http://www.usmef.org/news-statistics/press-releases/u-s-beef-pork-exports-
dip-slightly-lamb-rebounds/
Economic impacts – trade considerations
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OIE Bottom line related to vaccination:
• This is quite complex
• Unclear of time importers would bar
US exports – could easily exceed
OIE guidance
• Unclear if vaccination would really
change the time exports are barred
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All models are wrong.
Some models are useful.
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PI = Period One – movement controls and no livestock markets
PII = Period Two – included everything else
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Implications for
Preparedness and
Response
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US plan for vaccine
distribution, and administration.
Granularity in the plan is critical
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• World eradication for FMD may not be possible in the
near term
• Maybe FMD eradication from the America’s is
possible?
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THANK YOU FOR YOUR
ATTENTION!
QUESTIONS?
Pictures:
http://www.aphis.usda.gov/emergency_response/downloads/nahems/fad.pdf
Lameness a more
dominant feature in
swine; drooling is
rare.
Drooling more dominant
feature in cattle
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Korea (South and North) 2010-11 Outbreak
- March 8, 2011
“The recent FMD outbreak in South Korea has
caused one third of the country's pig herd to be
destroyed…”
“3.40 million pigs culled… Before the outbreak, pig
numbers in South Korea … 9.9 million. In addition,
151,000 cattle had to be culled”.
Full text: http://tinyurl.com/62bwa7g
By any measure, this outbreak was poorly managed.
Economic impacts of FMD outbreaks high
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US Team members
Dr. Gay Miller, Univ of IL, and adjunct UMN, (Summer appt 2007-2010;
USDA, APHIS, VS, EM&D, NCAHEM, NVS)
Dr. Scott Wells, University of Minnesota
Dr. Diego Fridmann, USDA, APHIS, VS, EM&D, NCAHEM
Mr. Richard Nolan, USDA, APHIS, VS, , EM&D, NCAHEM, NVS
Mr. Michael Gallagher, USDA, APHIS, VS, EM&D, NCAHEM, NVS
Dr. Tim Goldsmith, University of Minnesota
Dr. Shelley Mehlenbacher, University of Minnesota
Mr. Steven Downs, 3D Responder and Videographer, Clean Harbors
Environmental Services
Dr. Harry Snelson, American Association of Swine
Veterinarians
Dr. Elizabeth Parker, National Cattlemen’s Beef Association
Dr. Jamie Jonker, National Milk Producers Federation
Dr. Marvin Meinders, Department of Homeland Security
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Uruguay
and
Argentina
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So when vaccination is practiced - requires an additional
12 months with no FMD outbreaks to receive OIE FMD
free status.
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Recovery of FMD Free Status
Vaccination NOT practiced
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Article 8.5.47. of the OIE Terrestrial
Animal Code taken from
http://www.oie.int/index.php?id=169&L=0&htmfile=chapitre_1.8.5.htm on 4-3-13.
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OIE Bottom line related to vaccination:
• Decision to vaccinate is important
and will not be made lightly/easily.
• OIE recommendations for member
countries will be followed.
• Trade impacts will be large whether
or not vaccination is used.
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Risk and Consequence
Management
Risk transfer is not risk management.
Consequence transfer is not
consequence management.
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All models are wrong.
Some models are useful.
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Considerations and Details for US
FMD Preparedness and Response
• DIVA (Differentiating Infected from Vaccinated
Animals) very important – VAC Bank vs other
• Not all vaccines are DIVA compatible
• Vaccinated animals may become carriers of the
virus – field occurrence unknown, but may not
occur in a way that is affects transmission risk
• Multivalent vaccines are used in SA – US VAC
Bank can specifically target outbreak serotype
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Considerations and Details for US
FMD Preparedness and Response
• Identification of premises – no mandated ID
• Identification of animals – no mandated ID
• Communication with owners/managers
• Details of vaccine implementation – sketchy
• Personnel, time and other resources – not known
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US Consumers lack knowledge about FMD
Confuse FMD with other diseases
Research indicates:
• 72% of consumers think FMD affects humans
• 69% of consumers think people can get FMD from
infected meat
• 42% of consumers say they would stop drinking
milk if there is an FMD outbreak
Consumers’ care most about how FMD will impact
them and their family’s health. Consumers want
guarantees the food they are eating is safe.
From: FMD Cross-Species Communications team 2012 (includes Beef and Pork
checkoff, and Dairy Management, Inc.)
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Uruguay Emergency Vaccination Plan
Option 1: ‘Stamping out’ within the affected area and
compensation for animals and goods destroyed;
resources from the permanent compensation fund.
Option 2: ‘Stamping out’ within the affected area and
their contacts within the focal area, ring vaccination
around the focal area with further disposal of
vaccinated animals.
Uruguay Mass FMD Vaccination Study
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Uruguay Emergency Vaccination Plan
Option 3: Ring vaccination within a 10km radius of
outbreak, discontinuation of ‘stamping out’ and
emergency vaccination in a predetermined area, but
not general vaccination of the national herd.
Option 4: Option 3 is evaluated by authorities. If the
result is not as expected, then the entire cattle
population (national herd) will be vaccinated.
Uruguay Mass FMD Vaccination Study
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Uruguay Mass FMD Vaccination Study
FMD 2001 Outbreak highlights
End of Outbreak Declared by Uruguay 9-30-01
Uruguay Declared free by OIE 5-22-03
MGAP estimated 95% vaccine protection after 2nd
vaccination
24 million doses used in 69 days; ~10 million animals
Vaccine administered mainly by producers
Indemnity paid based on replacement not slaughter
value
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February 2010 National Survey Estimated %
of Protection
56% immunity in cattle under 1
84% immunity in cattle 1-2 years
94% immunity in cattle over 2
Consider age distribution of cattle in the US.
Uruguay Mass FMD Vaccination Study
Question: Would this vaccine used in Uruguay,
even with repeated doses (this vaccine efficacy
also declines fairly quickly after ~ 2.5 months),
provide protection to stop a US epidemic?
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February 2010 National Survey Estimated %
of Protection suggests:
Given US cattle age distribution suggests:
Uruguay Mass FMD Vaccination Study
Endemic vaccines (such as
those used in South America)
likely do not provide the
protection desired for emergency
use.
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Human food impacts of FMD Impacts will depend directly on response to
outbreak
USDA - initial response could be quarantines and
stop movement orders in areas of infection and
beyond.
If it became apparent the US were becoming
endemic, would US officials consider allowing
recovery in place? Would this occur de facto?
Would officials allow consideration for vaccination
of premises in the face of an outbreak?
When do we pull the trigger to vaccinate?
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All models are wrong.
Some models are useful.
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Recovery of FMD Free Status
Vaccination NOT practiced
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Recovery of FMD Free Status
Vaccination practiced
Summary:
• If using ONLY Stamping-out – 3 mo waiting after last case
• If using Stamping-out and vaccination – 6 mo waiting after last
case; may recovery time by 3 mo depending
• If using only emergency vaccination and NO Stamping-out – 18
mo waiting after last case; may recovery time by 15 mo
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Economic impacts of FMD outbreaks high
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