Dengue presentation


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Dengue presentation

  1. 1. 1
  2. 2. What is Dengue Fever? • Dengue fever, also know as breakbone fever, is an acute communicable disease caused by virus. • Infectious agent: Dengue viruses (categorize into types 1,2,3,4) 2
  3. 3. Vectors of Dengue Fever • Aedes aegypti - Aedes aegypti is not found in Hong Kong at present. • Aedes albopictus - Aedes albopictus is very common in Hong Kong. 3
  4. 4. Aedes mosquito Aedes Aegypti Aedes Albopictus 4
  5. 5. Vector Aedes albopictus The life cycle of a vector mosquito is divided into the 4 stages: egg, larva, pupa and adult 5
  6. 6. Habitual Behaviour of Aedes Albopictus (1) • Usually breed in stagnant water • Usually active in dark or shaded places outdoors, but indoor activity is also possible 6
  7. 7. Habitual Behaviour of Aedes Albopictus (2) • Female mosquitoes feed on human blood. • They are most active 2 hours before sunset (around 5pm to 6pm) and at around 8am to 9am. • Where do they sting? Outdoors and indoors. 7
  8. 8. DO YOU KNOW… • Dengue fever and dengue haemorrhagic fever are the most common mosquito-borne viral diseasein the world.• • Only the female mosquito feeds on blood. This is because they need the protein found in blood to produce eggs. Male mosquitoes feed only on plant nectar. • •The mosquito is attracted by the body odours, carbon dioxide and heatemitted from the animal or humans. • •The female Aedesmosquito searches for suitable places to lay their eggs. • •Aedes are day-biters, most active during dawn and dusk.
  9. 9. The Situation Worldwide • About 50 million cases annually worldwide • Incidence of dengue fever highest in tropical and subtropical regions • Recent increase in disease activity worldwide 9
  10. 10. Dengue Fever 2001 10 Regions with dengue fever
  11. 11. Mode of Transmission • A healthy person gets the disease when he is bitten by an infected mosquito. The virus enters his blood from the mosquito’s saliva. • An infected person could transmit the virus to mosquitoes if he is bitten by a mosquito anytime from the onset to the subsidence of the fever (a period of about 6 to 7 days). The disease is then spread by mosquitoes. • Dengue fever is not spread by contact with infected persons. 11
  12. 12. Transmission Infected mosquito Healthy person Incubation Period: 3 to 14 days Most commonly 4 to 7 days Infected person 12
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