vc1c vc wash cluster – emergency training 1 vector control module 1c dengue
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1VC1C
VCWASH Cluster – Emergency Training
Vector ControlModule 1C
Dengue
2VC1C
VCWASH Cluster – Emergency Training
•Blood borne viral disease spread by the bite of aedis aegypti mosquito•2 forms: Dengue fever + Dengue Hemorrhagic Fever •Up to 40% fatality in epidemics•No drugs or vaccines that work!
Dengue
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VCWASH Cluster – Emergency Training
Thrives in close proximity to humans
Transmitted by infected female mosquito
Aedes: The efficient vectorOften bites several people for one blood meal.
Found mainly in urban and semi urban areas
Lays eggs in artificial water containers
Short flight range of about 200 meters
Feeds preferentially on human blood
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VCWASH Cluster – Emergency Training
Behaviour of mosquitoes
Genus Breeding site Disease and distribution
Aedes aegypti mosquito
Biting period : DAY
Small water containers:
Cans, jars, gutters
Yellow fever : Africa and Americas
Dengue : Africa and Americas, Asia
Filariasis : Pacific
Anopeline mosquito
Biting period : NIGHT
Non polluted water: Edges of rivers, swamps, tanks, rice fields, saltwater without wave action
Malaria : Tropical and sub-tropical
Filariasis : Asia and Africa
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VCWASH Cluster – Emergency Training
Dengue
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VCWASH Cluster – Emergency Training
Breeding Sites
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VCWASH Cluster – Emergency Training
2003: 20 mega cities of > 10 mil. people; 75% developing world
Emerging global threat
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VCWASH Cluster – Emergency Training
Burden of Dengue/Dengue haemorrhagic fever world-wide reported to WHO
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VCWASH Cluster – Emergency Training
Case study exercise
Dengue, Burma
• Look at material • Answer questions• Feedback and discussion
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VCWASH Cluster – Emergency Training
Dengue, Burma
Distribution of Dengue Cases by State/Division in Myanmar, 2007
> 2,000
1,001 - 2,000
501 - 1,000
101 - 500
1- 100
0
Number of dengue cases 2007
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VCWASH Cluster – Emergency Training
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VCWASH Cluster – Emergency Training
Increased risk in Burma following Cyclone
Nargis because of;– Overcrowded conditions
– Fresh water was stored in unprotected containers
– Debris permits water collection and forms breeding sites
– Rural populations displaced to urban settings have lower herd immunity
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VCWASH Cluster – Emergency Training
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VCWASH Cluster – Emergency Training
Control
• Outdoor space spraying
• Larvicide