Since no vaccine is perfect, report any symptoms up to a year after foreign travel to your doctor. Remind the doctor of your travel itinerary and dates to help the doctor arrive at a diagnosis. Avoiding environmental effects can be tricky. Simple things such as seeking non-smoking areas in airports, hotels and restaurants can be adopted as a matter of course. Avoiding areas of political upheaval and violence is as important as avoiding medical health hazards.
Preparation can make a vacation a pleasant and educational experience.
Remember to leave adequate time for preparation. If you have specific questions about intended travel, call your physician. US State Department Overseas Travel Advisory, provides up to date information on travel conditions, visa requirements, political situations, etc.