West Nile Virus, 2001: Southern and Western Expansion

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West Nile Virus, 2001: Southern and Western Expansion. 3 rd National West Nile Virus Planning Meeting Atlanta, Georgia March 22-23, 2002 . WNV Surveillance, United States, 2001*: Order of Topics. ArboNET overview Birds Mosquitoes Equines Humans Summary & conclusions.
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West Nile Virus, 2001:Southern and Western Expansion 3rd National West Nile Virus Planning Meeting Atlanta, Georgia March 22-23, 2002 WNV Surveillance, United States, 2001*:Order of Topics
  • ArboNET overview
  • Birds
  • Mosquitoes
  • Equines
  • Humans
  • Summary & conclusions
  • How many states collected West Nile virus (WNV) surveillance data in 2001?
  • 39 state/local jurisdictions reporting dead bird denominator data
  • 35 - mosquito denominator data
  • 29 - human denominator data
  • 27 – veterinary/horse denominator data
  • 11 - sentinel animal denominator data
  • 4 - seroprevalence denominator data
  • As of 3/13/2002 How much activity in 2001? 199928 counties in 4 states reported any WNV activity 2000136 counties in 12 states & DC reported any WNV activity 2001358 counties in 27 states & DC reported any WNV activity MTN WNC ENC N Engl Mid-Atl PAC S Atl ESC WSC CDC Surveillance Regions States Reporting WNV-Positive Dead Birds, 2001* DC 7,338 birds 328 counties 27 states & DC * As of 3/13/2002 WNV Surveillance, United States, 2001*:Summary of Dead Bird Data
  • 69,102 dead birds reported
  • 32,918 tested (48% of reported)
  • 7,338 WNV-positive (22% of tested)
  • 5,161 in genus Corvus (71%)
  • 2,177 in other genera (29%)
  • 54% of tested crows “positive”
  • 9% birds from other species “positive”
  • * As of 3/13/2002 U.S. counties reporting any West Nile virus-infected birds in 1999 (N = 28 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - May 2000 (N = 4 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Jul 2000 (N = 40 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Aug 2000 (N = 88 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Sep 2000 (N = 122 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Oct 2000 (N = 134 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Dec 2000 (N = 136 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - May 2001 (N = 11 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Jun 2001 (N = 22 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Jul 2001 (N = 82 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Aug 2001 (N = 200 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Sep 2001 (N = 298 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Oct 2001 (N = 327 counties) U.S. counties reporting any West Nile virus-infected birds from Jan - Dec 2001 (N = 328 counties) 1st crow Last crow No. of WNV-Positive Crows Reported,Mid-Atlantic, New England, & South Atlantic Regions, by Week, 2001* Week ending *As of 2/1/02 1st U.S. crow Last crow No. of WNV-Positive Crows Reported, North Central & South Central Regions, by Week, 2001* *As of 2/1/02 States Reporting WNV-Positive Mosquito Pools, 2001* DC 918 pools 27 species 16 states & D.C. * As of 3/13/2002 Summary of Mosquito-Based WNV Surveillance,United States, 2001*
  • 918 WNV-positive mosquito pools
  • 27 positive species
  • 543 pools (59%) Cx pipiens,Cx restuans, or mixed
  • 70 (8%) Cx salinarius
  • Earliest: Cx pipiens, 31 MAY, Middlesex County, NJ
  • Latest: Cx pipiens, 25 OCT, Camden County, NJ
  • * As of 3/13/2002 WNV-Positive Mosquito Species Reported,United States, 2001* * As of 3/13/2002 U.S. Counties Reporting WNV-Positive Mosquitoes 1999 8 counties U.S. Counties Reporting WNV-Positive Mosquitoes 2000 JAN - JUL 6 counties U.S. Counties Reporting WNV-Positive Mosquitoes 2000 JAN - AUG 19 counties U.S. Counties Reporting WNV-Positive Mosquitoes 2000 JAN - SEP 27 counties U.S. Counties Reporting WNV-Positive Mosquitoes 2000 JAN - DEC 33 counties U.S. Counties Reporting WNV-Positive Mosquitoes 2001 JAN - JUN 6 counties U.S. Counties Reporting WNV-Positive Mosquitoes 2001 JAN - JUL 32 counties U.S. Counties Reporting WNV-Positive Mosquitoes 2001 JAN - AUG 61 counties U.S. Counties Reporting WNV-Positive Mosquitoes 2001 JAN - DEC 71 counties Non-Human Mammals Reported WNV-Infected, United States, 1999-2001 States Reporting Equine WNV Disease Cases, 2001* 731 cases 125 counties 19 states * As of 3/13/2002 U.S. counties reporting equine WNVillnesses1999 (N = 2 counties) U.S. counties reporting equine WNV illnessesJan - Aug 2000 (N = 6 counties) U.S. counties reporting equine WNV illnessesJan - Sep 2000 (N = 19 counties) U.S. counties reporting equine WNV illnessesJan - Oct 2000 (N = 26 counties) U.S. counties reporting equine WNV illnessesJan - Dec 2000 (N = 26 counties) U.S. counties reporting equine WNV illnessesJan - Jul 2001 (N = 9 counties) U.S. counties reporting equine WNV illnessesJan - Aug 2001 (N = 36 counties) U.S. counties reporting equine WNV illnessesJan - Sep 2001 (N = 84 counties) U.S. counties reporting equine WNV illnessesJan - Oct 2001 (N = 119 counties) U.S. counties reporting equine WNV illnessesJan - Nov 2001 (N = 124 counties) U.S. counties reporting equine WNV illnessesJan - Dec 2001 (N = 125 counties) States Reporting Human WNV Disease Cases, 2001* 66 cases 39 counties 10 states * As of 3/13/2002 U.S. counties reporting human WNV illness 1999 (N = 6 counties) U.S. counties reporting human WNV illness 2000 (N = 10 counties) U.S. counties reporting human WNV illness Jan - Jul 2001 (N = 5 counties) U.S. counties reporting human WNV illness Jan - Aug 2001 (N = 22 counties) U.S. counties reporting human WNV illness Jan - Sep 2001 (N = 33 counties) U.S. counties reporting human WNV illness Jan - Oct 2001 (N = 38 counties) U.S. counties reporting human WNV illness Jan - Dec 2001 (N = 39 counties) Reported Human WNV Disease Cases,United States, 1999-2001* * As of 3/13/2002 Human WNV Disease Cases, by Week of Onset, United States, 1999-2001* * As of 3/13/2002 Human WNV Disease Cases, by Week of Illness Onset, “Northern” vs. “Southern” United States, 2001* 7/7 8/4 9/1 9/29 10/27 11/24 12/23 * As of 3/13/2002 WNV Case-Patient Demographics & Mortality, United States, 1999-2001 * As of 3/13/2002 Summary of any WNV Activity,United States, 1999-2001* * As of 3/13/2002 Western-Most U.S. Counties Reporting WNV-Positive Bird 2001,2000,1999 * * 1st human cases, 1999 * Southern-Most U.S. Counties Reporting WNV-Positive Bird 2001, 2000, 1999 1st human cases, 1999 * WNV-Infected Crows, Horses, Mosquitoes, & Humans, South Atlantic Region, U.S., by MMWR Week, 2001* * As of 3/13/2002 Lead Time from WNV Surveillance Event to 1st Human Case, 39 Counties,United States, 2001* * As of 3/13/2002 National WNV Surveillance, 2001:Conclusions
  • Dramatic southward & westward expansion since 1999
  • Two major transmission foci in 2001: northeast & southeast
  • WNV probably entered Florida/Georgia in 2000
  • Major equine epizootic in 2001, especially in South Atlantic region
  • Only sporadic human cases despite intense epizootic in some areas
  • Prolonged transmission season observed
  • Bird and crow surveillance remain effective
  • Canada:Summary of WNV Surveillance, 2001*
  • Birds collected / tested in 7 provinces (PEI to Saskatchewan)
  • WNV-positives detected in S.E. Ontario (Windsor, London, & Toronto)
  • Of 2,592 birds tested, 121 (5%) WNV-positive
  • American crow -- 100/1449 (7%)
  • Bluejay -- 21/1056 (2%)
  • Common raven -- 0/61
  • Black-billed magpie -- 0/14
  • Other species -- 0/12
  • No human disease reported
  • * Provided by Health Canada Acknowledgements
  • ArboNET: Scores of partners in state and local health departments
  • DVBID/CDC:
  • Jennifer Lehman
  • Aaron Kipp
  • Veronica Elko
  • Kimlea Medlin
  • Dan O’Leary
  • John Jones
  • Roger Nasci
  • Chet Moore
  • Kathleen Julian
  • Mike Bunning
  • Steve Hinten
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