If you are traveling internationally you should be aware that conditions in other countries, both natural and synthetic, may be significantly different from those in the United States and may seriously affect health and personal security during travel. Standards of hygiene may be different. Food and water may be contaminated. The climate or environmental conditions may favor disease organisms which do not occur in the U.S.
Planning vaccinations before travel and recognition that travel to other countries is not without hazards, can make all the difference between an enjoyable, problem-free travel experience, or an unpleasant experience or at worst a disaster. Health, safety, accident avoidance and security are your responsibility and should be considered both before and during travel.