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

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


Hurricane rita vector control issues and the dshs response

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


Hurricane rita vector control issues and the dshs response

Pre-landfall Events


Hurricane rita vector control issues and the dshs response

State Operations Center (SOC)


Dshs entomologist

DSHS Entomologist

  • Conferences with State Epidemiologist concerning mosquito control activities following landfall

  • Conferences with CDC Entomologists offering assistance following landfill


Hurricane rita vector control issues and the dshs response

2,000,000 people without electricity for several weeks


Hurricane rita vector control issues and the dshs response

Rainfall ranged from 6- 10 inches in some areas


Hurricane rita vector control issues and the dshs response

Coastal tidal surges reportedly ranged from 4 – 15 feet


Hurricane rita vector control issues and the dshs response

Creation of new mosquito breeding sites


Hurricane rita vector control issues and the dshs response

Joint Field Office (JFO)


Hurricane rita vector control issues and the dshs response

Restoration of electrical power


Hurricane rita vector control issues and the dshs response

Debris removal and clean-up efforts


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


Hurricane rita vector control issues and the dshs response

Egg deposition sites for salt-marsh mosquitoes


Hurricane rita vector control issues and the dshs response

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


Hurricane rita vector control issues and the dshs response

Mosquito Landing Rate Count


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


Hurricane rita vector control issues and the dshs response

National Wildlife Areas/Preserves

NO SPRAY ZONES


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


Hurricane rita vector control issues and the dshs response

Ground ULV Unit


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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