Adults need to keep their vaccinations up to date because immunity from childhood vaccines can wear off over time. You are also at risk for different diseases as an adult. Vaccination is one of the most convenient and safest preventive care measures available.
You should ensure that your routine immunizations are all up-to-date –
If you are traveling internationally you should be aware that conditions in other countries, both natural and man-made, may be significantly different from those in the United States and may seriously affect health and personal security during travel.
Immunizations to prevent Typhoid and Hepatitis A are recommended for travel to areas where sanitary conditions are poor.
Yellow fever vaccination is mandatory for entry into some countries in Central Africa and South America. Travelers to these countries must possess an international certificate of vaccination to certify that they have had yellow fever vaccination.