MLT 2107 Dengue Fever

7/31/2019 MLT 2107 Dengue Fever

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MLT 2107

DENGUE


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Contents1. What is dengue fever

2. Symptoms of dengue fever

3. Characteristics of the Aedesmosquito

4. Life cycle of the Aedesmosquito

5. How the Aedesmosquito transmit diseases

6. How to prevent the spread of dengue fever

7. The 10-Mininute Mozzie Wipe-out Exercise


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What is dengue fever?

Dengue Fever is an illness caused byinfection with a virus transmitted by the

Aedesmosquito.


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Symptoms of Dengue Fever

Example of a skin rash dueto dengue fever


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Do you know

Dengue Fever (DF) and DengueHaemorrhagic Fever (DHF) are the mostcommon mosquito-borne viral disease in

the world.

It can be fatal.


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Dengue Virus1. Causes dengue and dengue hemorrhagic fever

2. It is an arbovirus3. Transmitted by mosquitoes

4. Composed of single-stranded RNA

5. Has 4 serotypes (DEN-1, 2, 3, 4)


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The most common epidemic vector of dengue in the world is theAedes

aegyptimosquito. It can be identified by the white bands or scalepatternson its legs and thorax.


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Characteristics of theAedes

MosquitoOne distinct physicalfeature black and

white stripes on itsbody and legs.

Bites during the day.

Lays its eggs inclean, stagnant water.

Close-up of an Aedes mosquito


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Only the femaleAedesmosquitofeeds on blood. This is becausethey need the protein found inblood to produce eggs. Malemosquitoes feed only on plantnectar.

On average, a femaleAedesmosquito can lay about 300 eggsduring her life span of 14 to 21days.

Do you know


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1-2 days

Stagnant water

Pupae

4-5 days

Life cycle of the Aedes Mosquito

Larvae Eggs

2-3 days


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How Do Aedes Mosquitoes TransmitDiseases...

Mosquito bites and sucksblood containing the virusfrom an infected person.

Virus is carried in itsbody.

And passes the virusto healthy peoplewhen it bites them.


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1.The virus is inoculated into

humans with the mosquito saliva.

2.The virus localizes and replicates

in various target organs, for

example, local lymph nodes and

the liver.

3.The virus is then released fromthese tissues and spreads through

the blood to infect white blood

cells and other lymphatic tissues.

4.The virus is then released from

these tissues and circulates in the

blood.


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5.The mosquito ingests blood containing the virus.

6.The virus replicates in the mosquito midgut, the ovaries, nerve

tissue and fat body. It then escapes into the body cavity, and later

infects the salivary glands.

7.The virus replicates in the salivary glands and when the mosquito

bites another human, the cycle continues.


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There are actually four dengue clinical syndromes:

1. Undifferentiated fever;

2. Classic dengue fever;3. Dengue hemorrhagic fever, or DHF; and

4. Dengue shock syndrome, or DSS.

Dengue shock syndrome is actually a severe form of

DHF.


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This is what you

can do to help


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Prevent Aedes from Breeding!

Remove ALL sources of

stagnant water.

Deny the Aedes mosquito of any

chance to breed.


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10-Minute Mozzie

Wipe-Out Exercise

D th 10 Mi t M i Wi t d


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Do the 10-Minute Mozzie Wipe-out everyday.

Change water in vases on alternate days.



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Remove water from flowerpot plates onalternate days.



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Turn over all pails and waterstorage containers.



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Cover bamboo pole holderswhen not in use.

D th 10 Minut M zzi Wip ut v r d


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Clear blockages and put Bti insecticide in roofgutters monthly.

Unwanted items


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Unwanted items

Do not litter. Rubbish such as cupsand bottles can collect rain waterand breed mosquitoes.


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Before you leave for holidays

B f l f h lid


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Cover all toilet bowls in your home.

Seal off the overflow pipe of the flushing cistern.

Cover all gully/floor traps.

Add sand granular insecticide to places thatmosquitoes could potentially breed, such as flowervases and places where stagnant water could not be

removed.

Before you leave for holidays


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Clear blockages and add Bti insecticide in roofgutters.

Turn over all water storage containers.

Ask a relative or close friend to check your homeregularly for stagnant water if you are going awayfor a long period of time.

Leave your contact with your neighbours or theneighbourhood police post/ centre so that you canbe reached easily.

Before you leave for holidays(Contd)


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Spread the dengue preventionmessage to others

Let your family,

friends andneighbours knowabout the dangersof

breeding Mozzies!!


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Documents

MLT 2107 Dengue Fever