There are many diseases spread through insect bites. There are vaccines and medicines available to help protect against some, others are prevented only through avoiding insect bites and treating bites properly. Spray insect repellents containing DEET on your skin, cover up with clothing, preferably treated with clothing treatment and sleep under mosquito nets which have also been treated. Use plug-ins and mosquito coils to repell biters from your room. This is your best defense action against nasty mozzies.