We strongly recommend that you contact your personal physician for recommendations regarding your individual health requirements while traveling. You should also be up-to-date with all of your shots, including tetanus and standard immunizations.
If you haven't already, please start thinking about updating any of your vaccinations that may be out of date (check with your doctor) and see the Centers for Disease Control website (http://wwwnc.cdc.gov/travel) for more specific information about the country or countries to which you'll be traveling.
Also, if you're located in Southern California and you have questions, consider contacting the Santa Ana Health Department at 714-557-5599 or 714-647-0401 for a consultation on what vaccinations you'll need. You should make an appointment as soon as possible as often there's a waiting period to schedule a time to meet. If located elsewhere, look up your local health department to do the same.