No vaccinations are officially required by the Vietnamese authorities, however immunization against cholera, hepatitis, typhoid, tetanus, polio and Japanese encephalitis is advised. Please consult your doctors for further medical advice. Also plan to bring mosquito repellent. Wearing long-sleeved shirts and slacks from dusk onward and avoiding perfume is also recommended. In addition to an ample supply of any prescription drugs you are taking (and a prescription which can be filled in case your pills go missing) bring medicines for: Headaches, diarrhea, constipation, insect bites, sore throats, eye drops, cuts, etc. Medical standards outside Hanoi and Saigon, Siemreap and Luangprabang are lower that those found in western countries.