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The content and pictures are adapted from the

Measures to prevent dengue fever. The content and pictures are adapted from the Food and Environmental Hygiene Department’s website. What is dengue fever?. Dengue fever is prevalent in regions 。 Transmitted by , it is an acute viral disease.

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  1. Measures to prevent dengue fever The content and pictures are adapted from the Food and Environmental Hygiene Department’s website.

  2. What is dengue fever? • Dengue fever is prevalent in regions。 • Transmitted by , it is an acute viral disease. • Prevalent in over countries and regions, and about 2 billion world population are under threat of its infection. tropical and subtropical mosquito bites 60

  3. What are the symptoms of dengue fever … • High fever for 3 to 5 days • Severe headache • Muscle and joint pain • Pain behind the eyes • loss of appetite, nausea • Rash • Severe cases may have bleeding, shock and even death incubation period ranges from 3 – 14 days

  4. How does it spread? • Transmitted by mosquitoes,  cannot be directly transmitted from person to person.。 • The vectors that spread the disease include: • Aedes aegypti • Aedes albopictus Found in Hong Kong

  5. How can you prevent it? • At present, there is no effective vaccine for dengue. So？

  6. We should first understand the vector of dengue fever－ Aedes albopictus

  7. Profile of Aedes albopictus • Name • Class • Origin of birth • Food • Active time • Characteristics • Aedes albopictus • Insect • South of Liaoning, east of Shaanxi, more common in the south of the Yangtze River • Blood（female） • Daytime, especially 2 hours after sunrise and several hours before sunset • Spread dengue virus

  8. Life cycle of Aedes albopictus • eggs：Usually laying eggs in stagnant water, a female mosquito can produce a time of about one hundred eggs.

  9. Life cycle of mosquitoes • Larva：Like a caterpillar, it floats with a respirator connecting it to the water surface.

  10. Life cycle of mosquitoes Pupa: Like a circular ball, the pupa comes to the water surface to breathe with a respirator.

  11. Life cycle of mosquitoes • Adult：breaks out of the pupa and leaves the water.

  12. The four stages take 7 days to complete. The first 3 stages proceed in water. So the best way to eliminate mosquito breeding is to remove stagnant water.

  13. Precautionary measures to prevent mosquitoes breeding：No. 1

  14. Precautionary measures to prevent mosquitoes breeding：No. 2

  15. Precautionary measures to prevent mosquitoes breeding：No. 3

  16. Precautionary measures to prevent mosquitoes breeding：No. 4

  17. Precautionary measures to prevent mosquitoes breeding：No. 5

  18. Precautionary measures to avoid mosquitoes bites • Wear long-sleeved clothes and long trousers • Use insect repellent over exposed parts of the body when outdoors • Use mosquito screens or nets when a room is not air-conditioned

  19. Please say how they remove stagnant water and eliminate mosquito breeding

  20. Answers: Leave no water in the saucers under flower pots Dispose of rubbish properly Pierce the tyres Cover tightly all water containers

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