BLUETONGUE VIRUS SURVEILLANCE UPDATE D R . D A V I D H S I V E T - - PowerPoint PPT Presentation

BLUETONGUE VIRUS SURVEILLANCE UPDATE

D R . D A V I D H S I V E T E R I N A R Y E P I D E M I O L O G I S T U . S . D E P A R T M E N T O F A G R I C U L T U R E A N I M A L A N D P L A N T H E A L T H I N S P E C T I O N S E R V I C E V E T E R I N A R Y S E R V I C E S O C T O B E R 1 9 , 2 0 1 6 1

Proposed Plan

Multi‐faceted BTV surveillance strategy, combining:

• Serologic surveillance of

cattle slaughter brucellosis samples

• Sentinel and vector

surveillance, and

• Aggregation of testing

data from bovine semen collection centers

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Objectives

• Define areas free or with low prevalence of

BTV, per OIE guidance, to support trade

• Explore BTV prevalence/distribution and

assess current ecology given concerns about potential impact of climate change

• Begin to establish a BTV serotype

distribution map to monitor future changes, and

• Help develop national BTV surveillance

strategy

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Serological Surveillance

• Update State risk status
• Provide baseline information
• 600 samples from brucellosis program

per low incidence/ free state/region

• ME, MA, CT, RI, VT, and NH (New England region)
• DE/MD (one region)
• NY, NJ/PA (one region)
• WV, OH, MI, IN, WI, MN, and ND
• Update State designation

‐ A State/ region will be considered low incidence/ free if seroprevalence <2.0% ‐ Epidemiological traceback investigations of positives

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Sentinel Surveillance

• Update State risk status
• Real‐time information
• ~260 calves sampled per State

‐ Sample subset of low‐incidence/ free states

‐Proposed: OH, PA, NY, WI, MN, MI ‐ Incentives provided

• Update State designation

‐ State considered low incidence if seroprevalence <2.0% ‐ PCR testing on positive samples

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Vector Surveillance

• Update disease transmission

risk

• Subset of sentinel surveillance

sites during vector season

• Samples analyzed for known

and potential vectors

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AI Center Data Aggregation

• Baseline information
• Working with Certified Semen Services
• Collect testing data from AI centers in

low‐incidence/ free States

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Expected Outcomes

• Update BTV

seroprevalence, risk information

• Support trade
• Develop national BTV

surveillance strategy

• Develop a BTV

serotype and vector distribution map in areas surveyed

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Current Status

• Serology testing

underway

• Outreach to internal

and external stakeholders

• Assessing funding

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Questions?

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• Dr. David Hsi

Veterinary Epidemiologist U.S. Department of Agriculture Animal and Plant Health Inspection Service Veterinary Services 970‐494‐7298 David.j.hsi@aphis.usda.gov