How can dengue fever be prevented according to the passage?

(Understanding)

Aedes mosquitoes spread dengue virus.

If an infected Aedes mosquito bites a man, he gets dengue fever.

To keep us free from dengue fever we have to throw away standing water from small containers. Besides, we have to keep our environment neat and clean. Moreover, we have to spray pesticides around our house.

Aedes mosquitoes lay their eggs in standing water in small containers like pots, bowls, cups, old tires, vases, etc.

The symptoms of dengue fever are high fever, muscle and joint pain, vomiting, bleeding, and skin rash.