Dengue

Topics: Dengue fever, Mosquito, Malaria Pages: 10 (797 words) Published: November 6, 2013
DENGUE FEVER / DENGUE
HEMORRHAGIC FEVER

Aedes

What is Dengue?


a mosquito-borne viral disease



transmitted by the bite of an
infected female Aedes
mosquito



caused by 4 serotypes of
Dengue virus: Den-1, Den-2,
Den-3 and Den-4



Dengue Virus

common during rainy season.
Aedes mosquito

Where is Dengue found?





reported from over 100 countries worldwide
approx. 2.5M people at risk
the most important mosquito-borne viral disease
in the world

PHILIPPINES
• Endemic in all regions
• 1st reported DHF outbreak in 1952 in Manila
• CAR : 1st reported in Mt. Province & Ifugao in the
early 90’s; at present, sporadic Dengue cases &
outbreaks were reported in all CAR provinces.

Who is affected w/ Dengue?


anybody can get sick w/
Dengue – regardless of
age, sex, health & social
status.



however, infants &
school children are
mostly affected;
generally 0–9 year old
age group.

What are the signs & symptoms
of Dengue Infection?











high continuous fever lasting
for 2 – 7 days
loss of appetite
nausea/vomiting
muscle & joint pain
pain behind the eye
abdominal pain
body weakness
nose/gum bleeding
presence of small reddish
spots or skin flushing on
arms, legs & body.

What are the Danger Signs of
Dengue?










continuous bleeding
sudden onset of abdominal
pain
persistent vomiting
listlessness
changes in mental
status/restlessness
rapid, weak pulse
cold, clammy skin
difficulty of breathing

What should be done to a
Dengue Suspect?






all dengue suspects should be
brought to the nearest health facility.
Do not give Aspirin as it may lead to
bleeding or may cause abdominal
irritation.
high fever should be managed by
sponging & giving Paracetamol.
start oral rehydration in the early
stages of fever
if symptoms persists for 3 or more
days or if danger signs appear, refer
the patient immediately to the
hospital .

How is Dengue transmitted?


only through the bite of an
infected female mosquito,
specifically called Aedes aegypti
or Aedes albopictus



the virus will reproduce inside
the body then illness follows
after 5 – 7 days



the mosquito becomes infected
when it bites people w/
Dengue Fever following 8 – 10
days after the bite. The
infected mosquito then
transmits the disease through
its bite to other people.

What are the characteristics of a
Dengue mosquito?
small, black & white insects

w/ stripes on its legs, body &
back , thus called the “Tiger”
mosquito; measures about 5mm
in size
feeding

female - blood meal

male feeds on plant juices &
nectars
generally day biters

bites all day long but prefers to
bite just after sunrise & before
sunset.

MOSQUITO VECTORS

Anopheles

Aedes

Culex

Mansonia

What are the characteristics of a
Dengue mosquito?









can fly from 50 – 300m to look
for blood meal or breeding site
1 female lays about 60 – 100
eggs per batch & lays about 3 –
4 batches of eggs in its lifetime
prefers dark color for
oviposition; breeds in artificial or
natural containers
Ae. aegypti prefers to rest cool
shaded places, dark corners,
closets & drawers; Ae. albopictus
– rests outdoor, among shrubs &
trees.
female Aedes mosquito feeds
every 2 – 3 days & it can survive
up 30 days.

Why are Dengue Epidemics
increasing?







increasing urban population
expanding mosquito breeding
sites

unreliable water supply

traditional water storage
practices

poor garbage collection

changing lifestyle
rapid transportation

movement of infected
humans

spread of dengue
mosquitoes
other related factors

What are the
common
breeding
sites of
Aedes
mosquitoes
?

How can Dengue be prevented?


eliminate mosquito breeding
sites (source reduction)

cover all water containers to
avoid entry of...
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