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Dengue fever (what (Dengue fever is an acute mosquito-borne infection…
Dengue fever
what
Dengue fever is an acute mosquito-borne infection caused by the dengue viruses. The dengue viruses encompass four different serotypes, each of which can lead to dengue fever and severe dengue (also known as 'dengue haemorrhagic fever').
where
This is found in tropical and sub-tropical regions around the world. For instance, dengue fever is an endemic illness in many countries in South East Asia.
where
An estimated 400 million dengue infections occur worldwide each year, with about 96 million resulting in illness. Most cases occur in tropical areas of the world, with the greatest risk occurring in:
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Central and South America (except Chile, Paraguay, and Argentina)
when
Dengue viruses have been on the march for more than 100 years. Dengue originated in monkeys and spilled over into humans as long as 800 years ago. It was restricted to Africa and Southeast Asia until the mid-20th century.
how it is transmitted
Dengue is spread through the bite of the female mosquito (Aedes aegypti). The mosquito becomes infected when it takes the blood of a person infected with the virus. After about one week, the mosquito can then transmit the virus while biting a healthy person.
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conditions
The risk is higher during the daytime, particularly around sunrise and sunset. Mosquitoes that can transmit dengue bite even in shady areas, when it is overcast, or if you are indoors.
The risk increases for those spending longer periods of time in areas where dengue occurs, including aid and humanitarian workers and/or those who stay in the home of friends and relatives.