Dengue infection is caused by the dengue virus that belongs to the family Flaviviridae.
There are 4 serotypes (DENV-1, DENV-2, DENV-3, DENV-4). Each serotype provides specific lifetime protective immunity against reinfection of the same serotype, but only temporary (within 2-3 months of the primary infection) and partial protection against other serotypes.
It is transmitted to humans through the bites of infected Aedes mosquitoes. It is primarily transmitted by female Aedes aegypti, a tropical and subtropical species. Humans are the main host of the virus.
After 4-10 days of incubation period, illness begins immediately.
Teens with severe obesity need not wait until they are adults to undergo Roux-en-Y gastric bypass, with 5-year follow-up data from a recent study showing that the bariatric procedure leads to substantial weight loss that is similar in magnitude in adolescents and adults.