1
2
What is it?
Mode of transmission
Symptoms and treatment
Prevention
Dengue Fever
3
What is Dengue Fever?
• Dengue fever, also know as
breakbone fever, is an acute
communicable disease caused by
virus.
• ...
4
• About 50 million cases annually
worldwide
• Incidence of dengue fever highest in
tropical and subtropical regions
• Re...
5
Regions with dengue fever
Dengue Fever 2001
6
The Situation in Hong Kong (1)
• 11 cases in 2000
• 17 cases in 2001
• First local case identified in September 2002
Imp...
7
The Situation in Hong Kong (2)
The Department of Health is working
closely with other government
departments to monitor ...
8
Vectors of Dengue Fever
• Aedes aegypti
Aedes aegypti is not found in Hong Kong
at present.
• Aedes albopictus
Aedes alb...
9
Vector
Aedes
albopictus
The life cycle of a vector mosquito is divided
into the 4 stages: egg, larva, pupa and adult
10
Habitual Behaviour of
Aedes Albopictus (1)
• Usually breed in stagnant water
• Usually active in dark or shaded
places ...
11
Habitual Behaviour of
Aedes Albopictus (2)
• Female mosquitoes feed on human blood.
• They are most active 2 hours befo...
12
Mode of Transmission
• A healthy person gets the disease when he is
bitten by an infected mosquito. The virus enters
hi...
13
Transmission
Infected
person
Healthy person
Infected
mosquito
Incubation Period: 3 to 14 days
Most commonly 4 to 7 days
14
Types
Classical
dengue
Dengue
haemorrhagic
fever
15
Symptoms of
Classical Dengue (1)
• Fever: continuous for 3 to 5 days
• Severe headache
• Painful limbs, joint pain, mus...
16
Symptoms of
Classical Dengue (2)
•Rash appears on the 3rd
to 4th
day after onset.
•Nausea, vomiting.
•Slight gum bleedi...
17
Treatment (1)
• At present, there is no drug that
can treat dengue fever
effectively. Patients infected with
classical ...
18
Treatment (2)
• Wiping the body with warm
water and proper use of
anti-fever drugs that can
relieve the fever.
• Don’t ...
19
Protect Yourself against
Dengue Fever
As yet, there is no effective vaccine against
dengue fever. Therefore, the best p...
20
Control the Spread of
Dengue Fever
Prevent the patient from being
bitten by mosquitoes.
21
Prevention of
Mosquito Bites
Avoid going out in the hours
when Aedes albopictus feed
or wear light-coloured,
long-sleev...
22
Prevention of
Mosquito Bites
•Apply DEET-containing
mosquito-repellents
over exposed parts of
the body and clothes
ever...
23
Prevention of
Mosquito Bites
Your place of
accommodation should
have air-conditioners or
mosquito nets. Otherwise,
hang...
24
Prevention of
Mosquito Bites
Install mosquito nets
to doors and windows
so that mosquitoes
can’t get in.
25
Elimination of Mosquitoes
The most effective way
to eliminate
mosquitoes is to
keep the environment
clean and to remove...
26
Possible Breeding Grounds of
Aedes Albopictus (1)
Artificial containers:
Vases, saucers underneath flower
pots, trays u...
27
Possible Breeding Grounds of
Aedes Albopictus (2)
Natural containers:
The hollow space inside a bamboo,
hollows of a tr...
28
Elimination of Mosquitoes
Cover water containers
tightly so that
mosquitoes can’t get in
to lay eggs.
29
Elimination of Mosquitoes
• Dispose of domestic
wastes properly to
prevent the
accumulation of
stagnant water.
• Dispos...
30
Elimination of Mosquitoes
•Change water for vases
and aquatic plants at
least once a week,
leaving no water under
the p...
31
Elimination of Mosquitoes
Remove or puncture any
dumped tyres to prevent
the accumulation of
stagnant water.
32
Elimination of Mosquitoes
Ditches should be free from blockage.
33
Elimination of Mosquitoes
Fill up uneven ground surfaces to prevent the
accumulation of stagnant water.
34
Elimination of Mosquitoes
Remove stagnant
water immediately if
mosquitoes are found
to be breeding. Use
environmentally...
35
Elimination of Mosquitoes
In cultivation ponds,
water tanks or large
containers, biological
controls such as
keeping fi...
36
37
The school is an ideal setting for
health promotion.
Targets: all staff, students and
parents.
• Enhance their understa...
38
Black Spots of Mosquito
Breeding in the Campus
• Garden / gardening corner / saucers
underneath flower pots / aquatic
p...
39
Eliminate mosquitoes:
• Planning, manpower arrangement,
areas to be inspected, inspection
time and record
• Please call...
40
Mosquito Elimination
Checklist (1)
• Are containers and other items where
water could accumulate disposed of
properly?
...
41
Mosquito Elimination
Checklist (2)
• Are ditches free from blockage?
• Are containers with stagnant water
cleaned regul...
42
See Doctor Immediately
•Having been bitten by
a mosquito and
displaying symptoms
of dengue fever
afterwards
•Falling il...
43
If you suspect that you have
dengue fever, the most
important thing to do is to
see a doctor.
44
Hotline / Web siteHotline / Web site
• Central Health Education Unit, Department
of Health
Hotline : 2833 0111
Web site...
45
Let’s remove stagnant water
and eliminate mosquitoes
of 45

Prevention+of+dengue+fever eng

Published on: Mar 4, 2016
Source: www.slideshare.net


Transcripts - Prevention+of+dengue+fever eng

  • 1. 1
  • 2. 2 What is it? Mode of transmission Symptoms and treatment Prevention Dengue Fever
  • 3. 3 What is Dengue Fever? • Dengue fever, also know as breakbone fever, is an acute communicable disease caused by virus. • Infectious agent: Dengue viruses (categorize into types 1,2,3,4)
  • 4. 4 • About 50 million cases annually worldwide • Incidence of dengue fever highest in tropical and subtropical regions • Recent increase in disease activity worldwide The Situation Worldwide
  • 5. 5 Regions with dengue fever Dengue Fever 2001
  • 6. 6 The Situation in Hong Kong (1) • 11 cases in 2000 • 17 cases in 2001 • First local case identified in September 2002 Imported cases Mosquito elimination has become an imminent matter.
  • 7. 7 The Situation in Hong Kong (2) The Department of Health is working closely with other government departments to monitor the spread of dengue fever in Hong Kong. Prompt measures to prevent and control the spread of the disease have been put in place.
  • 8. 8 Vectors of Dengue Fever • Aedes aegypti Aedes aegypti is not found in Hong Kong at present. • Aedes albopictus Aedes albopictus is very common in Hong Kong.
  • 9. 9 Vector Aedes albopictus The life cycle of a vector mosquito is divided into the 4 stages: egg, larva, pupa and adult
  • 10. 10 Habitual Behaviour of Aedes Albopictus (1) • Usually breed in stagnant water • Usually active in dark or shaded places outdoors, but indoor activity is also possible
  • 11. 11 Habitual Behaviour of Aedes Albopictus (2) • Female mosquitoes feed on human blood. • They are most active 2 hours before sunset (around 5pm to 6pm) and at around 8am to 9am. • Where do they sting? Outdoors and indoors.
  • 12. 12 Mode of Transmission • A healthy person gets the disease when he is bitten by an infected mosquito. The virus enters his blood from the mosquito’s saliva. • An infected person could transmit the virus to mosquitoes if he is bitten by a mosquito anytime from the onset to the subsidence of the fever (a period of about 6 to 7 days). The disease is then spread by mosquitoes. • Dengue fever is not spread by contact with infected persons.
  • 13. 13 Transmission Infected person Healthy person Infected mosquito Incubation Period: 3 to 14 days Most commonly 4 to 7 days
  • 14. 14 Types Classical dengue Dengue haemorrhagic fever
  • 15. 15 Symptoms of Classical Dengue (1) • Fever: continuous for 3 to 5 days • Severe headache • Painful limbs, joint pain, muscle pain, back pain, pain behind eyeballs
  • 16. 16 Symptoms of Classical Dengue (2) •Rash appears on the 3rd to 4th day after onset. •Nausea, vomiting. •Slight gum bleeding and nasal bleeding. •Extreme fatigue and depression may follow recovery. • In very rare cases, the condition may worsen into dengue haemorrhagic fever, leading to haemorrhage, shock or even death.
  • 17. 17 Treatment (1) • At present, there is no drug that can treat dengue fever effectively. Patients infected with classical dengue usually recovers in 1 to 2 weeks. • For serious cases, supportive treatments are provided by hospitals. • If you suspect that you have dengue fever, you should seek medical treatment promptly.
  • 18. 18 Treatment (2) • Wiping the body with warm water and proper use of anti-fever drugs that can relieve the fever. • Don’t take aspirin- containing drugs because they worsen the haemorrhage.
  • 19. 19 Protect Yourself against Dengue Fever As yet, there is no effective vaccine against dengue fever. Therefore, the best prevention is to avoid being bitten by mosquitoes by paying attention to the following: •Avoid staying in dark, outdoor places such as brushwood, pavilions or the shade of a tree during the hours when Aedes albopictus is active.
  • 20. 20 Control the Spread of Dengue Fever Prevent the patient from being bitten by mosquitoes.
  • 21. 21 Prevention of Mosquito Bites Avoid going out in the hours when Aedes albopictus feed or wear light-coloured, long-sleeved clothing and trousers.
  • 22. 22 Prevention of Mosquito Bites •Apply DEET-containing mosquito-repellents over exposed parts of the body and clothes every 4 to 6 hours. •For DEET products used by children, its concentration should be less than 10%.
  • 23. 23 Prevention of Mosquito Bites Your place of accommodation should have air-conditioners or mosquito nets. Otherwise, hang mosquito screens around your bed, use insecticides or coil incenses to repel mosquitoes.
  • 24. 24 Prevention of Mosquito Bites Install mosquito nets to doors and windows so that mosquitoes can’t get in.
  • 25. 25 Elimination of Mosquitoes The most effective way to eliminate mosquitoes is to keep the environment clean and to remove stagnant water so that mosquitoes can’t breed.
  • 26. 26 Possible Breeding Grounds of Aedes Albopictus (1) Artificial containers: Vases, saucers underneath flower pots, trays underneath air- conditioners, buckets, jars and jugs of earthenware, cement troughs, dumped tyres and solid wastes such as cans, disposable cups and bowls, and plastic bags.
  • 27. 27 Possible Breeding Grounds of Aedes Albopictus (2) Natural containers: The hollow space inside a bamboo, hollows of a tree and the rachis of a leaf.
  • 28. 28 Elimination of Mosquitoes Cover water containers tightly so that mosquitoes can’t get in to lay eggs.
  • 29. 29 Elimination of Mosquitoes • Dispose of domestic wastes properly to prevent the accumulation of stagnant water. • Dispose of empty bottles, cans and lunchboxes properly, such as into a covered bin.
  • 30. 30 Elimination of Mosquitoes •Change water for vases and aquatic plants at least once a week, leaving no water under the pots or in the bottom saucers. •Scrub the container surfaces thoroughly to
  • 31. 31 Elimination of Mosquitoes Remove or puncture any dumped tyres to prevent the accumulation of stagnant water.
  • 32. 32 Elimination of Mosquitoes Ditches should be free from blockage.
  • 33. 33 Elimination of Mosquitoes Fill up uneven ground surfaces to prevent the accumulation of stagnant water.
  • 34. 34 Elimination of Mosquitoes Remove stagnant water immediately if mosquitoes are found to be breeding. Use environmentally friendly insecticides such as lavicidal oil if necessary.
  • 35. 35 Elimination of Mosquitoes In cultivation ponds, water tanks or large containers, biological controls such as keeping fishes to eat mosquito larvae would be a good option.
  • 36. 36
  • 37. 37 The school is an ideal setting for health promotion. Targets: all staff, students and parents. • Enhance their understanding of mosquito-borne diseases. • Raise their awareness of dengue fever and evaluate the risks of it. • Encourage members of the whole school to play an active part in mosquito elimination. • Eliminate black spots of mosquito breeding.
  • 38. 38 Black Spots of Mosquito Breeding in the Campus • Garden / gardening corner / saucers underneath flower pots / aquatic plants • Tuckshop • Rubbish collection stations • Ditches • Toilets • Water tanks / pools
  • 39. 39 Eliminate mosquitoes: • Planning, manpower arrangement, areas to be inspected, inspection time and record • Please call the Food and Environmental Hygiene Department’s hotline for assistance if required: 2868 0000
  • 40. 40 Mosquito Elimination Checklist (1) • Are containers and other items where water could accumulate disposed of properly? (For example, throwing empty cans, foam rubber boxes, cups and bottles into a covered bin.) • Are water containers covered properly?
  • 41. 41 Mosquito Elimination Checklist (2) • Are ditches free from blockage? • Are containers with stagnant water cleaned regularly? (For example, vases, saucers underneath flower pots, water storage device of an air- conditioner, water tanks and pools.) • Are uneven ground surfaces filled to prevent the accumulation of stagnant water?
  • 42. 42 See Doctor Immediately •Having been bitten by a mosquito and displaying symptoms of dengue fever afterwards •Falling ill, especially having a fever within one month after you have returned from abroad
  • 43. 43 If you suspect that you have dengue fever, the most important thing to do is to see a doctor.
  • 44. 44 Hotline / Web siteHotline / Web site • Central Health Education Unit, Department of Health Hotline : 2833 0111 Web site : www.cheu.gov.hk • Food and Environmental Hygiene Department (about mosquito breeding) Hotline : 2868 0000 Web site : www.info.gov.hk/fehd
  • 45. 45 Let’s remove stagnant water and eliminate mosquitoes

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