In Brunei, like all tropical areas, mosquitoes are prevalent and can transmit disease. Dengue fever and Japanese encephalitis both occur in Brunei and it's recommended to use mosquito repellant at all times as well as considering the following vaccinations before travelling.
Generally, it is safe to drink the tap water and swim at local beaches. However, when red algae reaches certain levels, Bruneian authorities may issue Red Tide warnings which may advise against swimming in certain areas and eating certain types of seafood. The warnings, which vary from time to time depending on climatic conditions, are published in local English language and other newspapers.
If you are asthmatic or have breathing difficulties, be advised that there is smoke haze across some parts of Brunei usually during the July to October period. This haze can cause health problems for some people. Keep up-to-date with the advice of local authorities and seek medical advice on appropriate precautions
Brunei's healthcare system ranks among the best in Asia. The Raja Isteri Pengiran Anak Saleha (RIPAS) Hospital in the capital is equipped with highly modern medical facilities, and a number of private clinics operate within other districts. For more lists regarding private clinics click here: http://www.moh.gov.bn/nongovernment/download/privateclinics.pdf
You can buy at home or while traveling, and claim online from anywhere in the world. With 150+ adventure activities covered and 24/7 emergency assistance.