Guam Travel Health Advice
Although no vaccinations are required for travel to Guam, hepatitis A and hepatitis B vaccinations are recommended for all travellers. A Japanese encephalitis vaccination is recommended for those planning to spend time in rural areas or outdoors. An MMR (measles, mumps, rubella) vaccination is recommended if not previously given.
Do not drink tap water in Guam unless it has been boiled, filtered, or chemically disinfected, and don't have ice in your drinks. There are medical facilities available on the island but for life-threatening injuries or diseases you may well need to be transferred overseas to receive treatment; comprehensive travel insurance is recommended. It is best to bring along any medication you require, with a signed and dated letter from your doctor detailing the medication you need and why.