The association with some deadly diseases to humans has made mosquito as one of the important pest to be controlled if not eradicated. These disease are:

  1. Dengue Fever
  2. Zika Fever
  3. Japanese Encephalitis (JE)
  4. Malaria


1. Dengue Fever


Dengue Fever is a viral disease caused by Dengue virus.

Dengue is spread by several species of Aedes mosquitoes, predominantly Aedes aegypti.

Symptoms begin 3 to 14 days after infections may include high fever, headache, vomiting, muscle and joint pains and a characteristic skin rash.

If left untreated, the life-threatening dengue hemorrhagic fever might develop, resulting in bleeding, low levels of blood platelets and blood plasma which might lead to death.

It is a global problem and it is common in more than 110 countries, infecting 50 to 500 million people yearly and causing 10,000 to 20,000 deaths.

In Malaysia, more than 100,000 Dengue Fever cases was reported in 2016, with more than 300 fatalities. In January 2017 alone, more than 8,000 cases was reported with 7 fatalities.


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2. Zika Fever


Zika Fever is an infectious disease caused by Zika virus.

It is spread by the same Aedes mosquitoes that transmit Dengue virus.

In most cases, there are no obvious symptoms, but if present, symptoms are resemble to those of Dengue Fever.

It may not cause fatalities but mother-to-child transmission during pregnancy can cause Microcephaly (brain does not develop properly resulting in a smaller than normal head) and other brain malformation in babies.

The scary thing about this disease is it can be sexually transmitted and spread by blood transfusions.

An outbreak has been reported in Brazil in 2015 and subsequently spread to Americas, Asia Pacific and Africa. New cases are still being reported as of March 2017.

Malaysia confirmed its first Zika case in September 2016, after an over three months pregnant woman was tested positive for the virus following a visit to Singapore.

Since then 7 more cases were reported by end of 2016. According to the Health Ministry of Malaysia, there are no documented cases of Microcephaly associated with Zika virus as of today.

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3. Japanese Encephalitis (JE)


Japanese encephalitis is a type of viral brain infection that is spread through Culex mosquito which often bite and suck blood of domestic pigs and wild birds, the reservoirs of the virus and then transmit to humans.

It occurs mainly in rural parts of Asia.

About 1 in 4 person with encephalitis dies.

Up to half of those who survive have permanent disability.

It is believed that infection in a pregnant woman could harm her unborn baby.

In 1998, Malaysia experienced a Japanese encephalitis outbreak, which spread quickly from the Kinta Valley, Perak to around 250 km south in Sikamat and Bukit Pelanduk in Negeri Sembilan.

By April 2, 1999, there were 69 deaths in Malaysia with the majority from Bukit Pelanduk.


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4. Malaria


Malaria is an infectious disease caused by parasitic protozoans (single-celled microbes).

The disease is transmitted by Anopheles mosquitoes.

Its symptoms include fever, feeling tired, vomiting and headaches.

In severe cases, it can cause yellow skin, seizures, coma or death.

The disease is widespread in the tropical and subtropical regions.

In 2015, there were close to 300 million cases of Malaria worldwide, about 90% cases occurred in Africa, resulting in about 700,000 deaths.

In Malaysia, there were 4,725 case of Malaria reported in 2012 with 16 deaths, mainly occurred in Sabah and Sarawak.


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