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Hurricane Rita Vector Control Issues and the DSHS Response

Hurricane Rita Vector Control Issues and the DSHS Response. Diseases In Nature June 13, 2007 Austin, Texas. Vector Control Issues. Mosquitoes Floodwater mosquitoes Standing water mosquitoes. Mosquitoes. The clock starts ticking when water flow stops. Time of

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Hurricane Rita Vector Control Issues and the DSHS Response

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  1. Hurricane Rita Vector Control Issues and the DSHS Response Diseases In Nature June 13, 2007 Austin, Texas

  2. Vector Control Issues • Mosquitoes • Floodwater mosquitoes • Standing water mosquitoes

  3. Mosquitoes The clock starts ticking when water flow stops. Time of emergence is dependent upon species

  4. Hurricane Rita and Mosquito Control • Pre-landfall events • Landfall • Post-landfall events

  5. Pre-landfall Events

  6. State Operations Center (SOC)

  7. DSHS Entomologist • Conferences with State Epidemiologist concerning mosquito control activities following landfall • Conferences with CDC Entomologists offering assistance following landfill

  8. 2,000,000 people without electricity for several weeks

  9. Rainfall ranged from 6- 10 inches in some areas

  10. Coastal tidal surges reportedly ranged from 4 – 15 feet

  11. Creation of new mosquito breeding sites

  12. Joint Field Office (JFO)

  13. Restoration of electrical power

  14. Debris removal and clean-up efforts

  15. Mosquito Control: The Science • Bionomics of species • Documented Mosquito Landing Rate Counts • Data reflect trends • Insecticide Application • Too soon = no control • Too late = no or little control

  16. Egg deposition sites for salt-marsh mosquitoes

  17. Aedes sollicitans, Salt-Marsh mosquito

  18. Mosquito Landing Rate Count • Locations representative of area • Same time • Same observer • Number of mosquitoes landing/minute

  19. Mosquito Landing Rate Count

  20. Mosquito Landing Rate Count • Surveillance • Demonstrate need for application of insecticides (FEMA required) • Evaluation • Effectiveness of insecticide applications (FEMA required)

  21. Mosquito Landing Rate Count • Total number of documented adult mosquitoes that land in one minute on the front of one leg from the waist to the foot • FEMA/CDC determine the threshold number • FEMA/CDC set the time frame for mosquito control activities

  22. Mosquito Landing Rate Count • Documented • 70+ per minute in Port Arthur, Jefferson County • 40+ per minute in Bridge City, Orange County • 30 per minute in Hardin County

  23. U.S. Air Force Aerial Spraying • Orange, Jefferson, Chambers Counties • Documented Pre-spraying mosquito landing rate counts • Documented Post-spraying mosquito landing rate counts

  24. National Wildlife Areas/Preserves NO SPRAY ZONES

  25. U.S. Air Force Entomological Field Team • Air Force Institute of Operational Health, Brooks City-Base, Texas • Documented Pre-spraying mosquito landing rate counts • Recommended USAF Aerial Spray for portions of Hardin, Jasper and Newton counties based on their data

  26. Ground ULV Unit

  27. Acknowledgements • Dr.Tom Betz, Acting State Epidemiologist, DSHS • Dr. James Wright, DSHS, PHR 4/5

  28. Acknowledgements • Chambers County Mosquito Control District • Lawrence Lewis • Jefferson County Mosquito Control District • Lee Chastant • Orange County Mosquito Control District • Patrick Beebe

  29. Acknowledgements • CDC • Dr. Roger Nasci • Dr. Janet McAllister • USAF • Major Mark Breidenbaugh, Aerial Spray Flight • Dr. Chad McHugh, Entomology Field Team Leader • DOD • Captain John Morning

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