Post on 01-Feb-2016
description
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 waterflow stops. Time ofemergence 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