recommended procedures for sample collection, preservation and shipping dennis a. senne...
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Recommended Procedures forSample Collection,
Preservation and Shipping
Dennis A. [email protected]
(515) 663-7551USDA, APHIS, VS,
NVSL, Ames, Iowa 50010
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USDA-APHIS
Blood Collection
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Dilute yolk 1:2 (1ml PBS & 1ml Yolk)
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USDA-APHIS
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USDA-APHIS
AIV/ND SerologyTypes of Samples
Sample AGID ELISA HI/NI
Serum Yes Yes Yes
Plasma Yes Yes Yes
Egg Yolk Yes Yes Yes
Test
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USDA-APHIS
Sample Collection
• Please submit 0.5ml –1.0ml serum/plasma/yolk for serodiagnosisNeed 0.15ml for HINeed 0.2ml for NI
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USDA-APHIS
Isolation of AIV/NDSample Collection:
• Tissues (do not pool tissues from different birds)LungSpleenBrain if nervous signs
• Swabs (pool up to 5/tube)Tracheal (Tr) or oropharyngeal (Op)Cloacal (Cl)
Note: 1) Keep tissue and swabs cold (on ice), 2) Do not pool Tr/Op with Cl swabs
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USDA-APHIS
XCotton/dacron with
plastic shafts
Can interfere with PCR
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Tracheal Swab
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Oropharyngeal Swab
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USDA-APHIS
Isolation of AIV/NDSample Collection:
• Swab diluent (2-4ml/tube)
Brain-heart infusion broth (BHI)
Viral transport media
Tris-buffered tryptose broth (TBTB)
Nutrient broth (NB)
Peptone broth (PB)
Cell culture medium w/1% BSA
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USDA-APHIS
Sample CollectionNumber of Samples:
• Serology20 – 30 samples/flock95% confidence at 10% infection level
• Tissue3 – 5 birdsDo not pool tissue from different birds
• Swabs20 – 30 (pooled 5/tube)
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USDA-APHIS
Sample Size as a Function of Population Size and Minimum Probability of Detection
444342362910%
90868359395%
44836830099501%
99% CI
292928252210%
59595645315%
2942582259648D1%C
#10,000#1000 #500 #100 #50B 95% CIA
B Number of Birds in Flock
A Confidence Interval
C Prevalence Within the FlockD Number of Samples to Collect
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USDA-APHIS
Sampling for Disease Detection
• Rule of thumb for large populations for 95% confidence of detecting disease
• n = 3 x interval Minimum Prevalence Interval n
1% 1 in 100
3 x 100
= 300
10% 1 in 10 3 x 10
= 30
25% 1 in 4 3 x 4
= 12
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USDA-APHIS
Targeted Sampling Scenario – AI/ND in Vaccinated Populations
• Design a routine monitoring scheme (weekly, monthly etc.) – commercial and backyard flocks, especially ducks
• Within flock prevalence in vaccinated commercial flocks infected with HPAI could be as low as 0.1%.Rule of 3 X interval (1 in 1000), n = 3000 samplesNot practical
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USDA-APHIS
Targeted Sampling Scenario – AI/ND in Vaccinated Populations
• If focus on daily mortality
• Assuming a normal daily mortality rate of 0.1%
• If the observed mortality rate in a suspect HPAI infected flock = 0.2 – 1% (2 – 10 fold increase in mortality)If HPAI was the cause of increased mortality, expect
at least half the deaths are due to HPAITo detect 50% prevalence with 95% confidence
n = 6 (3 X 2)
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USDA-APHIS
• Very effective
• Focus on daily mortalities
All flocks monitored weekly (10 birds)
Compensates for under reporting of clinical disease
Targeted Surveillance “Barrel” Surveillance
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USDA-APHIS
Waterfowl Sampling
• May differ from domestic gallinaceous bird surveillancePoultry – respiratory infections (primarily) – Tr/Op swabsWaterfowl – intestinal infections – cloacal swabs
• Wild birds – define goals – HPAI only, all AIVHPAI (H5N1) – tracheal/Op swabs from mortalitiesAIV – cloacal swabs from live birds and mortalities
• Diagnostic testsVirus/RNA detection – best
Limitations of PCR (RNA extraction, PCR inhibitors)Antibody detection – limited value
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USDA-APHIS
Sample Preservation
• Serum: 4C-20C for storage
• Tissue/swabs/virus: 4C (up to 72-96 hours)-70C – long term storage-20 not recommended
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0 1 2 3 4 5 8 17 21 28 40Days at Condition
0
1
2
3
4
5
Stability of Hong Kong H5N1 Virusin Feces at Environmental Temperatures
Vir
us
Tit
er (
log
10)
Wet Feces(25 C)
Dry Feces(25 C)
Wet Feces(35 C)
Wet Feces(4 C)
Source: Shortridge et al. 1998
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Shipping Specimens to the
National Veterinary Services Laboratories (or other Institutions)
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USDA-APHIS
Definitions
Hazardous material: “…capable of posing an unreasonable risk to health, safety and property when transported in commerce.” (Department of Transportation [DOT])
Dangerous Goods: “…capable of posing a risk to health, safety, property or the environment…” (International Air Transport Association [IATA])
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USDA-APHIS
Classes of Dangerous Goods
1. Explosives2. Gas3. Flammable liquids4. Flammable solids5. Oxidizing substances
6. Toxic or infectious7. Radioactive8. Corrosive9. Miscellaneous
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USDA-APHIS
Applicable Regulations
• Department of Transportation (DOT)- 49 CFR Parts 171-175 (Hazardous Materials)
- Applies to all shipments (ground, air, water)- www.dot.gov/regulations.html
• International Air Transport Assoc (IATA)- Dangerous Goods Regulations
- Applies to air shipments- www.iata.org/whatwedo/dangerous_goods.html
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USDA-APHIS
Purpose of Regulations
“To ensure an acceptable level of safety for the transportation of hazardous & dangerous materials, including infectious and toxic substances, and to facilitate domestic and foreign transportation.”
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USDA-APHIS
Transport Regulations Apply To:
“Anyone who handles, offers for transport, transports or causes Dangerous Goods to be transported.”
These regulations apply to anyone who ships any infectious substance, diagnostic specimen or dry ice (to the NVSL or any other location).
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USDA-APHIS
Training Requirements
• All shippers of DG must be trainedTraining is valid for two yearsTraining must include an exam
• Records of training must be kept
• Training materials are available from IATA or from various private shipping companies
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USDA-APHIS
1. Classify
2. Identify
3. Package
4. Mark
5. Label
6. Document
7. Contact consignee
Shippers’ Responsibilities
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USDA-APHIS
Classes of Dangerous Goods
1. Explosives2. Gasses3. Flammable liquids4. Flammable solids5. Oxidizing substances6. Toxic or infectious
6.1 Toxins 6.2 Infectious substance
7. Radioactive8. Corrosive9. Miscellaneous (includes dry ice)
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USDA-APHIS
Proper Shipping Name andUN Number
UN 2814 Infectious substance, affecting humans
UN 2900 Infectious substance, affecting animals only
UN 3172 Toxic substance
UN 3373 Most diagnostic specimens
UN 1845 Dry ice
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USDA-APHIS
Infectious, Category A: UN 2814 (Infectious, affects humans)
Hendra virusNipah virusRift Valley fever virusEEE and VEE virusWest Nile virus (cultures only)Highly Pathogenic Avian Influenza (cultures only)
And many others – always check updated lists before shipping !
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USDA-APHIS
Infectious, Category A UN 2814 (Infectious, affects humans)
Bacillus anthracis culturesBrucella abortus culturesBrucella melitensis culturesBrucella suis culturesBurkholderia mallei culturesChlamydia psittici (avian cultures)Clostridium botulinum culturesEscherichia coli (verotoxigenic cultures)Francisella tularensis culturesMycobacterium tuberculosis cultures
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USDA-APHIS
Infectious, Category A: UN 2900(Infectious, affects animals only)
African horse sickness virusAfrican swine fever virusNewcastle disease virusBluetongue virusClassical swine fever virusFMD virus
And many others – always check updated lists before shipping !
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USDA-APHIS
Infectious, Category B
An infectious substance that does not meet the criteria for inclusion in Category A. Assign to: UN 3373 (diagnostic specimen) UN 2814 (infectious for humans), or UN 2900 (infectious for animals) as appropriate
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USDA-APHIS
Packing instruction 602
- Category A infectious substances
Packing instruction 650
- Category B infectious substances
- Diagnostic specimens
Packing Instructions
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USDA-APHIS
Category A shipments
Contact the NVSL (or any laboratory) for instructions before shipping any cultures or specimens suspected to contain a FAD or other Category A agent !!
These shipments require special permits and may require special chain of custody procedures.
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USDA-APHIS
Infectious Substance, Category B(UN 3373 – diagnostic specimens)
• Important requirementsLeak proof primary containerLeak proof secondary containerSufficient absorbent material to absorb entire
volume of specimen
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USDA-APHIS
Infectious substance, Category B (dry ice)
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USDA-APHIS
Infectious Substance, Category B (dry ice)
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USDA-APHIS
Infectious Substance, Category B (dry ice)
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USDA-APHIS
Diagnostic Sample (ice pack)
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Forms and Permits
Submission form (VS 10-4) Organisms and vectors permit (16-6A )
NVSL Submission Form Import Permit
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USDA-APHIS
Contact Information
Contact NVSL at this address for answers to shipping questions or to order supplies that are provided by the NVSL
http://www.aphis.usda.gov/vs/nvsl/JobAid/docs/VS10-4revised_v1.doc
NVSL Submission Forms:
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USDA-APHIS
Shipping Guidelines
• USDA permit required Can obtain from NVSL (515 663-7551)
• Shipping address:National Veterinary Services Laboratories
1800 Dayton Ave
Ames, Iowa 50010
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USDA-APHIS
NVSL, Ames, IowaOIE Reference Laboratory:Avian InfluenzaNewcastle disease
Thank You For Your Attention!