After 15yrs in Papua NewGuinea i found the best preventive is a good dose of common sense,cover up dont frequent unmossie proofed areas always spray a room before sleeping if you think they are there and always carry a mossie net regardless where you go.
Sure you will get it if you sit out side having a few beers after dusk.
Suggest always have a set of light cotton long sleeve shirts and long trousers and stay behind that stuff called fly wire and just be aware of what is buzzing around and you will be right.