P1246341517SfbRW - PowerPoint PPT Presentation

Title: P1246341517SfbRW


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WEST NILE VIRUS SURVEILLANCE CONTROL ACTIVITIES
IN EAST BATON ROUGE PARISH, LA GUY FAGET, FRED
AUGUSTINE, ALEX FOLSOM, DAN GARRETT, HERFF JONES,
RANDY VAETH, ROD WELLS, MATTHEW YATES EAST
BATON ROUGE MOSQUITO ABATEMENT RODENT CONTROL
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Typical Arbovirus Transmission Cycle
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Dead-end Host
Dead-end Host
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Phases of Arboviral Transmission Jan-Mar
Maintenance Phase Apr-June Amplification
Phase July-Aug Early Transmission Oct-Dec
Late Transmission
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SURVEILLANCE
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Birds
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WNV Bionomics-East Baton Rouge Parish Birds of
Interest
Northern Cardinal
Blue Jay
House Sparrow
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Wild Bird Blood Samples
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Sentinel Chickens
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Notable Bird Species for WNV 2004
TOTAL 101
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Notable Bird Species RT-PCR for WNV 2005
TOTAL 34
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WNV SENTINELS 2004, 2005
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OF ALL WNV BIRDS MAY-NOV 2004, 2005
N. CARDINALS 57 HOUSE SPARROWS 21
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OTHER WNV BIRDS 22 (MAY-NOV
2004, 2005) BLUE JAY N. MOCKINGBIRD BROWN
THRASHER COMMON GRACKLE MOURNING DOVE
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Mosquito Surveillance
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Quink breeding in proximity to houses
Human WNV activity
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Tire pile in proximity to houses
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High density Quink breeding
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Modular Wastewater Treatment Plants
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Breeding Resting Sites
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Storm Drain Surveillance
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Adult Mosquito Trapping Techniques
Rotator Trap
Modified Gravid Trap
New Jersey Trap
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Southern House Mosquito (up to 70 positive
in July, August)
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Asian Tiger Mosquito
Aedes vexans
Other potential vectors
Culex nigripalpus
Culex restuans
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Cx. salinarius Cx. erraticus Cx. coronator An.
crucians An. quadrimaculatus Ps. ferox Ps.
howardii Ae. canadensis Ae. fulvus pallens
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1st human cases MLE 6-8/1000 Late season cases
possibly from hunting activity
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1ST human case MLE of 6/1000 Late season cases
possibly from hunting activity
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CONTROL STRATEGY INTEGRATED MOSQUITO
MANAGEMENT
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Concentrated Larviciding in High Risk Areas
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LARVAL CONTROL Ditches Vectolex WDG 95 control
7-10 days
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Floodwater swales-Golden Bear Oil 95-100 control
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Modular Wastewater Treatment Facilities Altosid
Pellets, Vectolex WDG, Arosurf 90-100 control up
to 14 days
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Tirepiles Vectobac G 100 control, early instar
larvae
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Mosquito minnows
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Public Education
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Aerial and ground adulticiding initiated during
April May, continuing through September,
especially in high risk areas
Aerial application with naled
Ground ULV with pyrethroids
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Southern House Mosquito A Hard Target

• Asynchronous life cycle
• 2. Cryptic habitats, both resting and breeding
• 3. Active ALL night long
• 4. Ability to become tolerant to insecticides

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Summary
of Results
Cage Test 2004-3 Date 4-27-04 Insecticide
Scourge 110 App Rate 0.0013 lb/ac AI Species
Cpq Equipment Leco Distance (ft)
1 hr Mortality 12 hr Mortality
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AERIALLY APPLIED DIBROM VS QUINKS
MORT.
DISTANCE(FT)
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GRAVID TRAP S FOLLOWING AERIAL APPLICATION
8/16/05
QUINKS
DATE
.
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August 2005 Scourge vs Quinks _at_ Keokuk
Bottle Bioassay Results
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CONCLUSIONS

• Human case onsets seem to begin when MLEs reach
  6-8 quinks/1000.
• Northern Cardinals (and to a smaller degree,
  House Sparrows) seem to play an important role.
• Integrated Mosquito Mgt techniques can reduce
  human/WNV interactions.

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East Baton Rouge Parish Surveillance Questions
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• What happens during weeks26 34
• when mosquito sample percentages
• reach a maximum?

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2. How important are other vectors such as
Ae. albopictus?
222 pools submitted, 9 positive(4.05)
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3.What happens during Wintertime (maintenance
phase)?
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PONDERING THE REALLY TOUGH DILEMMAS
(LOUISIANA STYLE)