There is a high risk of mosquito-borne infections like malaria and dengue in Tanzania. Therefore, using DEET is a necessity. Globally, DEET is recognised as the most effective broad-spectrum insect repellent. It protects against mosquitos but also against ticks, biting flies and fleas. Avoiding mosquito bites is the best protection after all.
DEET is available in different concentrations ranging from 20 % to 50 %. The duration of protection varies accordingly with a 50% concentration lasting up to 12 hours. Higher concentrations do not increase the length of the protection.
Keep in mind, however, that you have to reapply it sooner when you are sweating. And, when using it in combination with sunscreen, you have to apply it after your sunscreen. DEET may decrease the SPF so it’s recommended to use it with a higher SPF than you would typically use.