To prevent dengue:
1. give the patient as much fluid as you can. whatever soft drink or anything the person likes.
2. make the one wear warm clothes.

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to prevent dengue we have to follow the below given steps :
1. we have to be hygienic as much as possible we have to be really careful of mosquito bites.
2. we have to take the dengue prevention vaccines such that we can not get dengue. 

hope so my answer is useful.........^_^ !!