Contagious: Dengue fever


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About contagion: Contagion and contagiousness refers to how easily the spread of Dengue fever is possible from one person to another. Other words for contagion include "infection", "infectiousness", "transmission" or "transmissability". Contagiousness has nothing to do with genetics or inheriting diseases from parents. For an overview of contagion, see Introduction to Contagion.

Contagion summary: Dengue is transmitted to people by the bite of an Aedes mosquito that is infected with a dengue virus. The mosquito becomes infected with dengue virus when it bites a person who has dengue or DHF and after about a week can transmit the virus while biting a healthy person. Dengue cannot be spread directly from person to person. 1

Contagion discussion: The biting activity of Aedes aegypti is greatest in the morning for several hours after daybreak, and in the late afternoon for several hours before dark. However, this mosquito sometimes feeds throughout the entire day indoors, in areas protected from direct sunlight or on overcast days. Aedes aegypti may sometimes feeds indoors during the night if lights are turned on. 2

Footnotes:
1. excerpt from Dengue and Dengue Hemorrhagic Fever: Questions and Answers: DVBID
2. excerpt from Spotlight on: Preventing Dengue and Dengue Hemmorhagic Fever: DVBID

Last revision: May 27, 2003

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