The content and pictures are adapted from the Food and Environmental Hygiene Department’s website.
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Transcript of The content and pictures are adapted from the Food and Environmental Hygiene Department’s website.
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
60
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