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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

Hurricane Rita Vector Control Issues and the DSHS Response

Diseases In Nature

June 13, 2007

Austin, Texas


Vector control issues
Vector Control Issues

  • Mosquitoes

    • Floodwater mosquitoes

    • Standing water mosquitoes


Mosquitoes

The clock starts

ticking when water

flow stops. Time of

emergence is dependent upon species


Hurricane rita and mosquito control
Hurricane Rita and Mosquito Control

  • Pre-landfall events

  • Landfall

  • Post-landfall events




Dshs entomologist
DSHS Entomologist

  • Conferences with State Epidemiologist concerning mosquito control activities following landfall

  • Conferences with CDC Entomologists offering assistance following landfill









Mosquito control the science
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



Aedes sollicitans, Salt-Marsh mosquito


Mosquito landing rate count
Mosquito Landing Rate Count

  • Locations representative of area

  • Same time

  • Same observer

    • Number of mosquitoes landing/minute



Mosquito landing rate count1
Mosquito Landing Rate Count

  • Surveillance

    • Demonstrate need for application of insecticides (FEMA required)

  • Evaluation

    • Effectiveness of insecticide applications (FEMA required)


Mosquito landing rate count2
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


Mosquito landing rate count3
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


U s air force aerial spraying
U.S. Air Force Aerial Spraying

  • Orange, Jefferson, Chambers Counties

  • Documented Pre-spraying mosquito landing rate counts

  • Documented Post-spraying mosquito landing rate counts



U s air force entomological field team
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



Acknowledgements
Acknowledgements

  • Dr.Tom Betz, Acting State Epidemiologist, DSHS

  • Dr. James Wright, DSHS, PHR 4/5


Acknowledgements1
Acknowledgements

  • Chambers County Mosquito Control District

    • Lawrence Lewis

  • Jefferson County Mosquito Control District

    • Lee Chastant

  • Orange County Mosquito Control District

    • Patrick Beebe


Acknowledgements2
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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