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You normally don't give antivirals for Dengue, in fact in Asia there are no true approved antivirals for Dengue, because it's an acute illness lasting for barely 2 weeks at most. It's self limiting and the virus will be eliminated by the host within said 2 weeks and granting immunity to the serotype.
So far AFAIK possible antivirals for Dengue are possibly indicated only for reinfection with a different serotype, as the severity of the disease increases when infected by a second or more serotype.
The treatment for Dengue is purely supportive with Paracetamol for fever control and fluid hydration adjusted based on intravascular fluid loss to prevent hypovolemic shock during the febrile and critical phases.
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