255 medical detachment (fwd) mosquito surveillance plan
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255 Medical Detachment (FWD)Mosquito Surveillance Plan
VECTOR BORNE
Outline
• Introduction
• Trap Index Calculation
• Trigger Points
• Trap Surveillance Data
• ULV Application
• Questions
Introduction• Map reconnaissance
– Conducted 2 May 03
– Identified trap locations
• Mosquito Trap Deployment– Initially deployed 5 traps, currently expanded to 8
– Numerous traps stolen
– Trap 7 nights a week used Deployed Ops HdBk (LTC Robert) to 4
• Vector Surveillance– Daily identify & count mosquitoes & sandflies in traps
– Compute trap index and compare to trigger points
– Test Anopheles mosquitoes if trapped for malaria
– Prepare sandflies for testing by 520th TAML
Introduction• Adult Mosquito Control
– ULV application based upon trap index & trigger points
– Conducted at 2000 until route completed
– 3 control routes on LSA Anaconda
– Routes determined by number of mosquitoes trapped along route
• Control Evaluation– Control efficacy determined by trap index after spraying
– Determines what pesticide to use
– To date SCOURGE is the insecticide used• Safe
• Effective
• Same chemical used in USA for West Nile Virus mosquito control
Trap Index Calculation
# of Mosquitoes trapped
# of Traps x # of nights
Adult FemaleMosquito
Index
=
93
8 x 1=
11.625=
Trigger Points
• Trigger Point = Suppression action initiated • Vector Suppression Trigger Point = Trap Index of 1
mosquito– If 1 Anopheles mosquito is trapped, suppression action is
initiated– Anopheles mosquitoes are the only (VECTORS) carriers of
malaria
• Nuisance Suppression Trigger Point = Trap Index of 5 mosquitoes– If 5 of any other type of mosquito is trapped, control action
is initiated.– Nuisance mosquitoes do not vector disease, but do bite.
ULV Application
• Triggered by Trap Index
• Applies insecticide in a “fog” of very small particles (8-30 microns)
• Particles float in the air, sunset to sun rise.
• Mosquitoes fly into fog & die.
• Weather conditions can preclude spray ops– too windy or rain
Home station PMCS/Trng
1
7
5
6
82
4
3
• Upon arrival at LSAA– Immediate help
– Numerous requests
• Problems identified– No FST
– No FST equipment
– No repellant
– No treated uniforms
– Minimal bed nets
• Education = Problem solving– Proper use of OH
equipment
– NSNs to order equipment
– FST trng class
– Unit level trng
Offered Permethrin bed net treatments
Combined calibration 255th & 792nd MED DETs
IdentificationMosquito species trapped:Ochlerotatus caspiusCulex pipiens complexCuliseta longiareolata
VecTest for Anopheles10 total for the season
Improvised release stations
0
5
10
15
20
25
30
35
40
45
50
5/3/
03
5/5/
03
5/7/
03
5/9/
03
5/11
/03
5/13
/03
5/15
/03
5/17
/03
5/19
/03
5/21
/03
5/23
/03
5/25
/03
5/27
/03
5/29
/03
Date
Tra
p In
dex
Trap Index Mosquito Trap Index Sandfly ULV Treament
Lar
val
0
5
10
15
20
25
30
35
40
456/
1/03
6/3/
03
6/5/
03
6/7/
03
6/9/
03
6/11
/03
6/13
/03
6/15
/03
6/17
/03
6/19
/03
6/21
/03
6/23
/03
6/25
/03
6/27
/03
6/29
/03
Trap Index Mosquito Trap Index Sandfly ULV Treatment
0
20
40
60
80
100
120
140
1607/
1/03
7/3/
03
7/5/
03
7/7/
03
7/9/
03
7/11
/03
7/13
/03
7/15
/03
7/17
/03
7/19
/03
7/21
/03
7/23
/03
7/25
/03
7/27
/03
7/29
/03
Trap Index Mosquito Trap Index Sandfly ULV Treatment
0
20
40
60
80
100
1208/
1/03
8/3/
03
8/5/
03
8/7/
03
8/9/
03
8/11
/03
8/13
/03
8/15
/03
8/17
/03
8/19
/03
8/21
/03
8/23
/03
8/25
/03
8/27
/03
8/29
/03
Trap Index Mosquito Trap Index Sandfly ULV Teatment
Lar
val
AAR• CON
– Larval treatments work?• Didn’t look at age of mosquitoes
• Different soldiers conducted dips
• Water level greatly reduced on post
– Better at identifying mosquitoes thru resources• No regional keys on hand
• Harbach (1985) only key
• PROS– When we left everyone begged us to come back
– Used 4 out of 6 pieces of entomology equipment on MTOE
– Real world missions
Questions
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