WNV Surveillance Update United States, July 2005

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WNV Surveillance UpdateUnited States, July 2005

• Matthew J. Kuehnert, MD
• Assistant Director For Blood Safety
• Division of Viral and Rickettsial Diseases
• Theresa L. Smith, MD, MPH
• Division of Vector-Borne Infectious Diseases

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The ArboNET Team 2004

• Amy Bode
• Jennifer Brown
• Grant Campbell
• Margaret Collins
• Nicholas Crall
• Lora Davis
• Edward Hayes
• Alison Hinckley

• John Jones
• Krista Kniss
• Stephanie Kuhn
• Jennifer Lehman
• Anthony Marfin
• Susan Montgomery
• Daniel OLeary
• Theresa Smith

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ArboNET

• Arbovirus national electronic surveillance system
• Ecologic data
• Human data
• Disease reports
• West Nile fever (WNF)
• West Nile Neuroinvasive Disease (WNND)
• Presumptively Viremic Donors (PVDs)

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U.S. Counties Reporting Human WNV Disease Cases,
2004
2,470 WNF 1,142 WNND 505 counties 100 deaths 40
states and DC
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WNND County Level Incidence per Million, United
States, 2004
Reported as of 6/21/2005
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WNV Transfusion-associated Transmission
Investigations, 2004

• 14 case investigations initiated
• 8 non-cases
• 5 inconclusive
• 1 probable case
• MMWR 9/17/04
• Maricopa County, AZ
• WNND s/p RBC transfusion
• First human infection detected in county of
  residence

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West Nile virus cases by week of onset and week
of report, US , 2004
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Comparisons to this time in 2003 and 2004 MMWR
Week 28
2003 2004 2005
Human Cases 1 108 25
States reporting human cases 1 10 11
PVDs 1 18 7
States reporting PVDs 1 2 2
States reporting any activity 31 34 and PR 26
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Comparisons to this time in 2003 and 2004 MMWR
Week 29
2003 2004 2005
Human Cases 5 182 41
States reporting human cases 3 11 15
PVDs 1 23 19
States reporting PVDs 1 3 6
States reporting any activity 32 35 and PR 27
AZ, AR, CA, CO, GA, IN, KS, LA, MN, MS, MO, NM,
OH, SD, TX AZ, CA, IA, LA, MS, TX
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WNV Activity Summary, July 2005

• 2005 vs. 2004 season comparisons
• 2005 season starting slower
• more geographic variation, but similar patterns
• South, Midwest and West now affected North may
  have increase in activity later in season
• PVD activity in areas without known WNV disease
  may provide prevention opportunity (e.g., IA)