To reduce the risk of getting Malaria, you should:
Use anti-malaria treatment as an avoidance measure
Avoid mosquito bites, especially after sunset. If you are out at night wear long-sleeved clothing and long trousers
Use an insecticide spray (such as Permethrin) on clothes as mosquitoes can bite through thin layers of clothing. AVOID spraying insecticide on the skin!
Spray pesticides in the room (especially beneath bedside lockers and other bedroom furniture), burning pyrethroid coils, and heating insecticide-coated tablets all help to repel mosquitoes
Use an insect repellent (ideally one that contains DEET) on areas of skin that are exposed
If you are staying in a place where there are no insect screens, you should strongly consider keeping the windows closed
Use a mosquito net while sleeping - hint: spray insecticide on your net to further prevent mosquito bites
Vitamin B, garlic and ultrasound devices DO NOT offer protection against mosquitoes bites.