Hurricane rita vector control issues and the dshs response
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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

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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

emergence is dependent upon species


Hurricane Rita and Mosquito Control

  • Pre-landfall events

  • Landfall

  • Post-landfall events


Pre-landfall Events


State Operations Center (SOC)


DSHS Entomologist

  • Conferences with State Epidemiologist concerning mosquito control activities following landfall

  • Conferences with CDC Entomologists offering assistance following landfill


2,000,000 people without electricity for several weeks


Rainfall ranged from 6- 10 inches in some areas


Coastal tidal surges reportedly ranged from 4 – 15 feet


Creation of new mosquito breeding sites


Joint Field Office (JFO)


Restoration of electrical power


Debris removal and clean-up efforts


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


Egg deposition sites for salt-marsh mosquitoes


Aedes sollicitans, Salt-Marsh mosquito


Mosquito Landing Rate Count

  • Locations representative of area

  • Same time

  • Same observer

    • Number of mosquitoes landing/minute


Mosquito Landing Rate Count


Mosquito Landing Rate Count

  • Surveillance

    • Demonstrate need for application of insecticides (FEMA required)

  • Evaluation

    • Effectiveness of insecticide applications (FEMA required)


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 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

  • Orange, Jefferson, Chambers Counties

  • Documented Pre-spraying mosquito landing rate counts

  • Documented Post-spraying mosquito landing rate counts


National Wildlife Areas/Preserves

NO SPRAY ZONES


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


Ground ULV Unit


Acknowledgements

  • Dr.Tom Betz, Acting State Epidemiologist, DSHS

  • Dr. James Wright, DSHS, PHR 4/5


Acknowledgements

  • Chambers County Mosquito Control District

    • Lawrence Lewis

  • Jefferson County Mosquito Control District

    • Lee Chastant

  • Orange County Mosquito Control District

    • Patrick Beebe


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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