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