The canadian experience with wnv testing
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The Canadian Experience with WNV Testing. Bill Casley, PhD Centre for Biologics Research Biologics and Genetic Therapies Directorate Health Canada. West Nile Virus Regulatory Consultative Workshop. February 18-19, 2004. Seasonal Testing ? Blood supply Stockpiling during “safe” season?

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The Canadian Experience with WNV Testing

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The Canadian Experience with WNV Testing

Bill Casley, PhD

Centre for Biologics Research

Biologics and Genetic Therapies Directorate

Health Canada


West Nile Virus Regulatory Consultative Workshop

February 18-19, 2004

  • Seasonal Testing ?

  • Blood supply

    • Stockpiling during “safe” season?

    • Geographic restrictions on collection?

    • Minipool vs Individual Testing?

  • Cells Tissues and Organs

    • Validation and approval of NAT tests


Blood Issues

  • Capacity to undertake single unit testing

    • 10% of total collections

  • Regional differences in collection/testing

    • Rationale must be effectively communicated

  • Different strategies for Hema Quebec and Canadian Blood Services

    • Seasonal vs year-round testing

    • Triggers for single unit testing/suspended collection


CTO Issues

  • Risks from different transplantable tissues unclear

    • Research required

  • Approved tests for CTOs not available

  • NAT testing for CTOs not uniform across provinces

    • Role for BGTD in overseeing proficiency scheme


WNV Issues to be Addressed2004

  • Review of sensitivity and specificity data of the Roche Diagnostics commercial WNV test

  • What are the risks to switching to seasonal testing over the winter period 2004-2005?

  • Should single unit testing be the standard test method in 2005?

  • Do all living and cadaveric transplant donors need to be tested for WNV?


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