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.

Prevalent in over countries and regions, and about 2 billion world population are under threat of its infection.

tropical and subtropical

mosquito bites

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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

incubation period ranges from 3 – 14 days

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 albopictusFound in Hong Kong

How can you prevent it?

At present, there is no effective vaccine for dengue.

So ？So ？

We should first understand the vector of dengue fever －

Aedes albopictus

Profile of Aedes albopictus

Name Class Origin of birth

Food Active time

Characteristics

Aedes albopictusInsectSouth of Liaoning, east of Shaanxi, more common in the south of the Yangtze RiverBlood （ female）Daytime, especially 2 hours after sunrise and several hours before sunsetSpread dengue virus

Life cycle of Aedes albopictus

eggs ： Usually laying eggs in stagnant water, a female mosquito can produce a time of about one hundred eggs.

eggs ： Usually laying eggs in stagnant water, a female mosquito can produce a time of about one hundred eggs.

Life cycle of mosquitoes

Larva ： Like a caterpillar, it floats with a respirator connecting it to the water surface.

Larva ： Like a caterpillar, it floats with a respirator connecting it to the water surface.

Life cycle of mosquitoes

Pupa: Like a circular ball, the pupa comes to the water surface to breathe with a respirator.

Pupa: Like a circular ball, the pupa comes to the water surface to breathe with a respirator.

Life cycle of mosquitoes Adult ： breaks out of the

pupa and leaves the water. Adult ： breaks out of the

pupa and leaves the water.

The four stages take 7 days to complete.

The first 3 stages proceed in water.

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.So the best way to eliminate mosquito breeding

is to remove stagnant water.

Precautionary measures to prevent mosquitoes breeding ： No. 1

Precautionary measures to prevent mosquitoes breeding ： No. 2

Precautionary measures to prevent mosquitoes breeding ： No. 3

Precautionary measures to prevent mosquitoes breeding ： No. 4

Precautionary measures to prevent mosquitoes breeding ： No. 5

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

Please say how they remove stagnant water and eliminate mosquito breeding

Answers:

Pierce the tyres

Leave no water in the saucers under flower

pots

Cover tightly all water containers

Dispose of rubbish properly