Browsed by
Day: September 1, 2016

Life Cycle of Aedes

Life Cycle of Aedes

life cycle

Life Stages of Aedes Mosquitoes

•• Adult, female mosquitoes lay their eggs on the inner, wet walls of containers with water, above the waterline.
•• Eggs are very hardy; they stick to the walls of a container
like glue and can survive drying out for up to 8 months

•• Larvae emerge from mosquito eggs, but only after the
water level rises to cover the eggs. This means that
rainwater or humans adding water to containers with eggs
will trigger the larvae to emerge.
•• Larvae feed on microorganisms in the water. After molting
three times, the larva becomes a pupa.

•• Pupae will develop until the body of the newly formed
adult flying mosquito emerges from the pupal skin and
leaves the water.

•• After adult mosquitoes emerge: male mosquitoes feed
on nectar from flowers and female mosquitoes feed on
humans and animals for blood to produce eggs.
•• After feeding, female mosquitoes will look for water
sources to lay more eggs.
•• Aedes aegypti only flies a few blocks during its life.
•• Unlike other mosquito species, Aedes aegypti mosquitoes
prefer to bite people.
•• Aedes aegypti mosquitoes prefer to live near people. They
can be found inside homes, buildings, and businesses
where window and door screens are not used or doors are
left propped open.


Dengue Fever Cases in Malaysia

Dengue Fever Cases in Malaysia

History of Dengue in Malaysia

In November 15, 1902,Skae reported the first known published account of an outbreak of dengue in Malaya. He described a dengue outbreak in the northern state of Penang from December 1901 to March 1903. Severe dengue (Dengue Haemorrhagic Fever) was first observed in Malaya in the city of Georgetown, Penang in November 1962.

From the 1960s dengue cases began to spread into the urban areas of Penang and Kuala Lumpur. By the early 1970s, DHF had spread to the whole Malaysia and has since caused a significant health burden to the population in Malaysia.

Epidemiology of Dengue in Malaysia


In Malaysia, dengue is predominantly an urban disease due to the abundance of the principle vector Aedes aegypti which is at a close proximity to high densities of susceptible hosts. The states of Selangor, Wilayah Persekutuan Kuala Lumpur and Johor are the areas that have been largely affected by the disease and are reporting high numbers of cases.

Factors like population growth in urban areas, the indiscriminate disposal of waste coupled with the lack of efficient solid waste management and the increased and efficient movement of dengue viruses in infected humans through modern transportation have all contributed to the marked increase in the occurrence of dengue.


After reporting 120 836 dengue fever cases in 2015 , the highest number of cases reported, Malaysia appears to be continuing that trend with summer upon us and the health ministry has reported nearly 50,000 cases through the first five months on 2016.

From Jan. 1 through May 31, Malaysia has seen 49,830 dengue fever cases, with greater than half reported from Selangor State (26,704). Johor state has seen 6800 cases followed by Kuala Lumpur with 3400. Through mid-May, 109 dengue related fatalities have been reported.



What is Dengue Fever?

What is Dengue Fever?



Dengue is a viral infection spread by mosquitoes. It’s widespread in many parts of the world. In most people the infection is mild and passes in about a week without causing any lasting problems. But in rare cases it can be very serious and potentially life threatening.

There’s no specific treatment or widely available vaccine for dengue, so it’s important to try to avoid being bitten by mosquitoes when visiting an area where the infection is found.

Four closely related viruses cause dengue fever. The viruses are transmitted fromAedes aegypti and Aedes albopictus mosquitoes to humans in a viral life cycle that requires both humans and these mosquitoes. There is no human-to-human dengue fever transmission. The viruses belong to the Flaviviridae family and have an RNA strand as its genetic makeup. Virologists term them dengue virus types 1-4 (DENV 1-4). All four serotypes are closely related. However, there are enough antigenic differences between them that if a person becomes immune to one serotype, the person can still be infected by the other three serotypes The best way to prevent dengue fever is to prevent the bites from infected mosquitoes.