Cause
Dengue virus is primarily transmitted by Aedes mosquitoes, particularly A. aegypti.[4] These mosquitoes usually live between the latitudes of 35° North and 35° South below an elevation of 1,000 metres (3,300 ft).[4] They typically bite during the day, particularly in the early morning and in the evening,[19][20] but they are able to bite and thus spread infection at any time of day all during the year.[21] Other Aedes species that transmit the disease include A. albopictus, A. polynesiensis and A. scutellaris.[4] Humans are the primary host of the virus,[4][14] but it also circulates in nonhuman primates.[22] An infection can be acquired via a single bite.[23] A female mosquito that takes a blood meal from a person infected with dengue fever, during the initial 2–10 day febrile period, becomes itself infected with the virus in the cells lining its gut.[24] About 8–10 days later, the virus spreads to other tissues including the mosquito's salivary glands .