Dengue disease is a deadly disease, if not treated early, things might get even worse.
First, to avoid dengue, avoid throwing your trash all over the streets, canals, or around your environment. This is where mosquitoes like to stay and it is where they also breed.
Second, try to open a campaign about cleaning the environment and avoiding dengue diseases. This might help decrease the number of mosquitoes.
Third, if ever you get bitten by a mosquito, go to the doctor. There are already several centers giving out free vaccine to avoid dengue.
Fourth, if ever you might need support, you can ask some people to help support your commuity.
That's what i know :)