West Nile Virus in Brazos County 2012             Mark M. Johnsen Ph.D.          Environmental Health Services        Braz...
West Nile Virus• West Nile Neuroinvasive Disease (WNND) –  severe disease that affects the nervous system  (West Nile meni...
WNV Human Infection “Iceberg”               <1%           ~10% fatal               CNS           (<0.1% of total infection...
Symptoms in HumansSymptoms manifest 4 to 10 days after being bitten by an infected mosquitoFlu-like Symptoms•   Fever     ...
WNV Activity in the United States 2012
WNV Activity in the United States 2012• 4,531 human cases in 2012  – 2,293 WNND  – 2,238 WNF  – 183 Mortalities• Texas is ...
Top Five Counties   County        Mortalities   WNND   WNF   TotalDallas County        18        169    206   375Tarrant C...
Trapping Data• Brazos County divided into 4 regions (College Station, Bryan, Texas  A&M University, Unincorporated Brazos ...
Southern House Mosquito Culex quinquefasciatus                          Gravid Trap  Asian Tiger Mosquito   Aedes albopictus
Trapping Data• 32,721 mosquitoes trapped for testing• 71 WNV positive mosquito pools  – 22 Bryan  – 26 College Station  – ...
Positive Mosquito Pools    County        Positive Mosquito Pools Harris County             493 Dallas County             2...
West Nile Virus Activity in Brazos CountyYear      Human WNND   Human WNF   Mortalities   Mosquito   Bird       Horse     ...
4                5            81        6
WNV Human Cases                       West Nile Virus Activity in Brazos County                                           ...
Article was written on August 3, 2012 The golf course was positive for its 8th week in a row.
Questions?• City of College Station   – Marshall Wallace   – Barbara Moore• City of Bryan   – Bob Holmes   – Cody Cravatt•...
West Nile Virus in Brazos County 2012
West Nile Virus in Brazos County 2012
West Nile Virus in Brazos County 2012
West Nile Virus in Brazos County 2012
West Nile Virus in Brazos County 2012
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West Nile Virus in Brazos County 2012

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West Nile Virus in Brazos County 2012

  1. 1. West Nile Virus in Brazos County 2012 Mark M. Johnsen Ph.D. Environmental Health Services Brazos County Health Department
  2. 2. West Nile Virus• West Nile Neuroinvasive Disease (WNND) – severe disease that affects the nervous system (West Nile meningitis, West Nile encephalitis, and West Nile meningoencephalitis)• West Nile Fever (WNF) – cases that show no evidence of neuroinvasion
  3. 3. WNV Human Infection “Iceberg” <1% ~10% fatal CNS (<0.1% of total infections) disease Crude estimates ~20% “West Nile Fever” ~80% Asymptomatic
  4. 4. Symptoms in HumansSymptoms manifest 4 to 10 days after being bitten by an infected mosquitoFlu-like Symptoms• Fever • Pain associated with eye movement• Headache • Irritability• Sore throat • Memory Loss• Nausea and vomiting • Stiffness• Confusion • Weakness• Disorientation • Paralysis• Sore throat • Seizures• Diarrhea • Coma• Drowsiness • Death• Photophobia
  5. 5. WNV Activity in the United States 2012
  6. 6. WNV Activity in the United States 2012• 4,531 human cases in 2012 – 2,293 WNND – 2,238 WNF – 183 Mortalities• Texas is responsible for 37% of WNV human cases State Number of Human Cases Texas 1,683 California 285 Louisiana 239 Mississippi 229 South Dakota 200
  7. 7. Top Five Counties County Mortalities WNND WNF TotalDallas County 18 169 206 375Tarrant County 10 104 152 256Denton County 2 51 120 171Travis County 3 56 73 129Collin County 4 22 36 58Harris County 4 35 23 58
  8. 8. Trapping Data• Brazos County divided into 4 regions (College Station, Bryan, Texas A&M University, Unincorporated Brazos County)• Three permanent sites• 7-9 Traps set weekly• 147 Traps set in Brazos County in 2012 • 52 Bryan • 46 College Station • 39 TAMU campus • 10 Unincorporated areas
  9. 9. Southern House Mosquito Culex quinquefasciatus Gravid Trap Asian Tiger Mosquito Aedes albopictus
  10. 10. Trapping Data• 32,721 mosquitoes trapped for testing• 71 WNV positive mosquito pools – 22 Bryan – 26 College Station – 23 TAMU – 0 Unincorporated areas of Brazos County
  11. 11. Positive Mosquito Pools County Positive Mosquito Pools Harris County 493 Dallas County 267 Travis County 127Wichita County 28Brazoria County 11Orange County 7
  12. 12. West Nile Virus Activity in Brazos CountyYear Human WNND Human WNF Mortalities Mosquito Bird Horse Total 02002 0 0 15 3 2 20 02003 5 0 15 2 7 29 02004 1 0 2 3 5 11 02005 0 3 14@ 14 1 33 02006 7 7 25 7 4 50 12007 1 1 2 1 0 5 12008 4 1 25 2 0 32 02009 0 0 1 0 0 1 02010 0 0 0 0 0 0 02011 0 0 0 0 0 0 02012# 7 5 71 0 1% 85 As of October 23, 2012
  13. 13. 4 5 81 6
  14. 14. WNV Human Cases West Nile Virus Activity in Brazos County WNV Mosquito Cases 12 11 10 9 8Number of Cases 7 6 5 4 3 2 1 0 Trapping Weeks
  15. 15. Article was written on August 3, 2012 The golf course was positive for its 8th week in a row.
  16. 16. Questions?• City of College Station – Marshall Wallace – Barbara Moore• City of Bryan – Bob Holmes – Cody Cravatt• TAMU – Tracy Carroll – Jason Alexander – Kristen Robinson

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