hurricane rita vector control issues and the dshs response diseases in nature june 13, 2007 austin,...
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Hurricane Rita Vector Control Issues and the DSHS
Response
Diseases In Nature
June 13, 2007
Austin, Texas
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Vector Control Issues
Mosquitoes Floodwater mosquitoes Standing water mosquitoes
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Mosquitoes
The clock starts ticking when waterflow stops. Time ofemergence is dependent upon species
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Hurricane Rita and Mosquito Control Pre-landfall events Landfall Post-landfall events
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Pre-landfall Events
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State Operations Center (SOC)
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DSHS Entomologist
Conferences with State Epidemiologist concerning mosquito control activities following landfall
Conferences with CDC Entomologists offering assistance following landfill
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2,000,000 people without electricity for several weeks
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Rainfall ranged from 6- 10 inches in some areas
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Coastal tidal surges reportedly ranged from 4 – 15 feet
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Creation of new mosquito breeding sites
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Joint Field Office (JFO)
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Restoration of electrical power
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Debris removal and clean-up efforts
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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
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Egg deposition sites for salt-marsh mosquitoes
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Aedes sollicitans, Salt-Marsh mosquito
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Mosquito Landing Rate Count
Locations representative of area Same time Same observer
Number of mosquitoes landing/minute
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Mosquito Landing Rate Count
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Mosquito Landing Rate Count
Surveillance Demonstrate need for application of
insecticides (FEMA required)
Evaluation Effectiveness of insecticide applications
(FEMA required)
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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
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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
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U.S. Air Force Aerial Spraying
Orange, Jefferson, Chambers Counties Documented Pre-spraying mosquito
landing rate counts Documented Post-spraying mosquito
landing rate counts
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National Wildlife Areas/Preserves
NO SPRAY ZONES
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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
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Ground ULV Unit
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Acknowledgements
Dr.Tom Betz, Acting State Epidemiologist, DSHS
Dr. James Wright, DSHS, PHR 4/5
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Acknowledgements
Chambers County Mosquito Control District Lawrence Lewis
Jefferson County Mosquito Control District Lee Chastant
Orange County Mosquito Control District Patrick Beebe
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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