Bovine Spongiform Encepalopathy, BSE Should FAO have maintained its silence?
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Transcript of Bovine Spongiform Encepalopathy, BSE Should FAO have maintained its silence?
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Bovine SpongiformBovine SpongiformEncepalopathy, BSEEncepalopathy, BSEBovine SpongiformBovine SpongiformEncepalopathy, BSEEncepalopathy, BSE
Should FAO have Should FAO have maintained its silence?maintained its silence?
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Why did FAO sound the alert?Why did FAO sound the alert?Why did FAO sound the alert?Why did FAO sound the alert?
Active surveillance for BSE introduced by some infected countries indicated higher rates of infection than previously thought
By end 2000, beginning 2001 BSE was discovered in major EU countries so far having denied possibility if infection
The EU is a major global exporter of cattle and by-products
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Years of first report of native BSEYears of first report of native BSEYears of first report of native BSEYears of first report of native BSE
Up to 1987
1989 - 1994
1995 - 1999
2000, 2001
1997
2000
2001
1994
1991
1989
1990
Portugal reported BSE in imported cattle in 1990
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Year of birth of earliest caseYear of birth of earliest caseYear of birth of earliest caseYear of birth of earliest case
UK: 1973/74 FRANCE, IRELAND: 1981 SWITZERLAND, PORTUGAL: 1984 BELGIUM, NETHERLANDS: 1993 GERMANY: 1994 DENMARK: 1996
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Means of spreadMeans of spreadMeans of spreadMeans of spread
Meat and bone meal (MBM) regarded as most important means of spread
Free trade in the EU facilitated spread of BSE at a time, when the disease had not even been recognized
Recycling of bovine tissues as feed led to amplification
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Epidemiology of BSEEpidemiology of BSEEpidemiology of BSEEpidemiology of BSE
Evidence of amplification: France, Portugal, Switzerland
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BSE RisksBSE RisksBSE RisksBSE Risks
Risk of Importation: BSE in imported cattle and in homebred cattle fed imported infective material
Risk of amplification: Propagation of BSE through recycling of animal by-products in susceptible species
Risk to humans: vCJD probably through consumption of infective material of bovine origin
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Countries at risk of BSE in Countries at risk of BSE in native livestocknative livestockCountries at risk of BSE in Countries at risk of BSE in native livestocknative livestock
those that have: imported live cattle originating from affected
countries
or imported meat meal containing infective tissue
and recycle ruminant by-products in ruminants
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Cattle Exports from UKCattle Exports from UKCattle Exports from UKCattle Exports from UK
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
Eur-
W
N&
M-E
ast
Afr
-N
Afr
-SSA
Am
-C
Am
-N
Am
-S
Asi
a-E
Eur-
E
Oce
ania
88 to 90
91 to 95
96 to 99
Importing RegionEC-SSC considered 5% of birth cohort born between1988 and 1993 in UK infected
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Cattle Exports from W-EuropeCattle Exports from W-EuropeCattle Exports from W-EuropeCattle Exports from W-Europe
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
Eur-E
N&M
-Eas
t
Afr-N
Afr-S
SA
Am-C
Am-N
Am-S
Asia
-C
Asia
-E
Asia
-S
Asia
-SE
Oce
ania
88 to 90
91 to 95
96 to 99
Importing Region
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Global trade in MBMGlobal trade in MBMGlobal trade in MBMGlobal trade in MBM
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
2,000,000
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
Metric tons
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Exports of MBM by RegionExports of MBM by RegionExports of MBM by RegionExports of MBM by Region
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000W
-Eur UK
E-Eu
r
N-E
ast
M-E
ast
S-A
sia
E-A
sia
SE-A
sia
Oce
ania
N-A
m
C-A
m
S-A
m
88 to 90
91 to 95
96 to 99
Metric tons
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Imports from other regionImports from other regionImports from other regionImports from other region
0
500,000
1,000,000
1,500,000
W-E
ur UK
E-Eu
r
N-A
fr
N-E
ast
M-E
ast
S-A
sia
E-A
sia
SE-A
sia
Oce
ania
N-A
m
C-A
m
S-A
m
SSA
88 to 90
91 to 95
96 to 99
Metric tons
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Trade Matrix of MBM (1996-99)Trade Matrix of MBM (1996-99)Trade Matrix of MBM (1996-99)Trade Matrix of MBM (1996-99)
0
500,000
1,000,000
1,500,000
2,000,000A
fr-N
Am
-C
Am
-N
Am
-S
Asi
a-E
Asi
a-SE
Eur-
E
Eur-
UK
Eur-
W
N&
M-E
ast
Oce
ania
Am-N
Am-S
Asia-E
Asia-SE
Eur-UK
Eur-W
Oceania
Importer
Exporter
Metric tons
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EU Regional Risk AnalysisEU Regional Risk AnalysisEU Regional Risk AnalysisEU Regional Risk Analysis
Qualitative analysis based on– External challenge: likelihood and amount of BSE
agent entering into a defined geographical area– Stability: the ability of a BSE/cattle system to
prevent the introduction and to reduce the spread of the BSE agent within its borders
not feeding MBM to cattle rendering system (133/20/3) SRM removal
– Interactions of the above
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Epidemiology of BSEEpidemiology of BSEEpidemiology of BSEEpidemiology of BSE
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EU-Geographic BSE Risk AnalysisEU-Geographic BSE Risk AnalysisEU-Geographic BSE Risk AnalysisEU-Geographic BSE Risk Analysis
Not done
Highly unlikely
Unlikely
Likely or lower level
Confirmed at higher
level
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Problems in Risk QuantificationProblems in Risk QuantificationProblems in Risk QuantificationProblems in Risk Quantification
Meat meals are not differentiated in trade statistics (pig, poultry, fish, cattle)
Cross-contamination of meat meals and livestock feeds
Differences in ‘riskiness’ of MBMs by country and period
Triangular trade Compound feed
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BSE Risk in other SpeciesBSE Risk in other SpeciesBSE Risk in other SpeciesBSE Risk in other Species
TSEs occur in most species BSE shown to be able to infect a number
of wild ungulates (in zoos) BSE shown to be infective for cats Transmission to sheep a distinct
possibility Oral transmission to pigs and poultry so
far not successful
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Uncertainties/UnknownsUncertainties/UnknownsUncertainties/UnknownsUncertainties/Unknowns
Cause: Novel infectious agent, PRION, but this is disputed by some scientists
Origin of BSE-Prion: Main hypothesis is crossing of species-barrier by scrapie agent, but alternative hypotheses exist
Transmission: Feed generally accepted as main vehicle, but vertical and horizontal transmission not excluded
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Uncertainties/UnknownsUncertainties/UnknownsUncertainties/UnknownsUncertainties/Unknowns
Infection: Single exposure vs cumulative effect
Genetic component: is susceptibility linked to certain genotypes?
Diagnostic test for live animals: Is it possible to develop and how long will it take?
Etc, etc, etc....
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The Risk Manager’s DilemmaThe Risk Manager’s DilemmaThe Risk Manager’s DilemmaThe Risk Manager’s Dilemma
‘Can we know the risks we face now and in the future?’
‘No, we cannot, but yes, we must act as if we do!!!’
‘Science will not provide all the answers!’
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FAO recommendsFAO recommendsFAO recommendsFAO recommends
National Risk Analysis to determine own risk status
Surveillance for BSE in cattle at risk of having been exposed to infective material
Restriction of MBM in ruminant feed Banning of Specified Risk Materials and
fallen stock from MBM Stricter Feed and Meat industry regulation
and enforcement thereof
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Information on BSEInformation on BSEInformation on BSEInformation on BSE
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EU measures to tackle BSEEU measures to tackle BSEEU measures to tackle BSEEU measures to tackle BSE
A ban on the feeding of mammalian meat and bone meal (MBM) to cattle, sheep and goats, as of July 1994;
Higher processing standards for the treatment of animal waste (133 degrees, 3 bars of pressure for twenty minutes) to reduce infectivity to a minimum, as of 1 April 1997;
Active surveillance measures for the detection, control and eradication of BSE, as of 1 May 1998 and the introduction of post-mortem testing from 1 January 2001;
The requirement to remove specified high-risk materials (SRMs like spinal cord, brain, eyes, tonsils, parts of the intestines) from cattle, sheep and goats throughout the EU from 1 October 2000 from the human and animal food chains.
The introduction of targeted testing for BSE, with a focus on high risk animal categories, from 1 January 2001. This measure will be reviewed and extended to all cattle aged over 30 months entering the food chain from 1 July 2001;
The prohibition of dead animals not fit for human consumption to be used for feed production as from 1 March 2001 onwards.
In addition there are country specific measures in force in several Member States, especially those with the highest incidence of BSE.
A ban on MBM to all farm animals and fishmeal to ruminants, from 1 Jan 2001
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Proposed draft code of practice on Proposed draft code of practice on safe animal feedingsafe animal feedingProposed draft code of practice on Proposed draft code of practice on safe animal feedingsafe animal feeding
GENERAL PRINCIPLES AND REQUIREMENTS
RAW MATERIALS, MINERALS, VITAMINS AND FEED ADDITIVES Raw materials of animal, plant and/or marine origin should be obtained
from reputable sources, preferably with a supplier warranty......
LABELLING Labelling requirements shall ensure traceability for all feedingstuffs of
their origin, full labelling of ingredients, the correct use of permitted additives.....
TRACEABILITY AND RECORD KEEPING Traceability of raw materials, minerals, vitamins and feed additives in
feedingstuffs should be ensured by proper labelling and record keeping....
INSPECTION AND CONTROL PROCEDURES Official regulatory programmes should be established....
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HEALTH HAZARDS ASSOCIATED WITH ANIMAL FEED It is essential that the levels of hazardous substances in feed are
sufficiently low....
Feed Additives Feed additives should be assessed for safety and approved under
stated conditions of use...... Antibiotics should not be used in feedingstuffs for growth promoting purposes in the absence of public health safety assessment....
Feed materials Feed materials contaminated with mycotoxins in excess of established
national maximum levels or international maximum levels established should not be fed to animals.....
Feedingstuffs Feedingstuffs may be marketed only if they are wholesome,
unadulterated and of merchantable quality....
Undesirable Substances Undesirable substances such as pesticides, agricultural and industrial
chemicals, heavy metals, radionuclides, zoonoses, mycotoxins, and other microbiological contamination of feedingstuffs should be minimized......
Proposed draft code of practice on Proposed draft code of practice on safe animal feedingsafe animal feedingProposed draft code of practice on Proposed draft code of practice on safe animal feedingsafe animal feeding
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INDUSTRIAL PRODUCTION OF ANIMAL FEEDINGSTUFFS The producer or manufacturer should establish quality
assurance systems based on the principles of Good Manufacturing Practice (GMP). The HACCP principles, as annexed to the Codex “Recommended International Code of Practice - General Principles of Food Hygiene” 5 should be preferred....
ON-FARM PRODUCTION AND USE OF FEEDINGSTUFFS [To be developed, including provisions for HACCP]
Proposed draft code of practice on Proposed draft code of practice on safe animal feedingsafe animal feedingProposed draft code of practice on Proposed draft code of practice on safe animal feedingsafe animal feeding
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INDUSTRIAL PRODUCTION OF ANIMAL FEEDINGSTUFFS
Good Manufacturing Practice (GMP) based on HACCP
ON-FARM PRODUCTION AND USE OF FEEDINGSTUFFS
GMPs for dairy production
GMPs for pig production
GMPs for poultry
Intensive pasture-based systems
AGA Technical Support to AGA Technical Support to Codex Code of PracticeCodex Code of PracticeAGA Technical Support to AGA Technical Support to Codex Code of PracticeCodex Code of Practice
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HACCP for the Feed IndustryHACCP for the Feed IndustryHACCP for the Feed IndustryHACCP for the Feed Industry
Raw materials Feed mill Transport On-farm Slaughter Treatment of by-products (rendering) Meat
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Possible FAO ActionsPossible FAO ActionsPossible FAO ActionsPossible FAO Actions
Mechanisms to assist countries in national risk assessments
Development of appropriate risk management options, including....
HACCP for the feed industry GMPs for on-farm practice Support of capacity building for BSE
surveillance and control