A one-time booster dose is recommended for travelers who have previously completed a standard course of polio immunization. Refer to CDC guidelines for vaccinating unimmunized or incompletely immunized persons. Need for vaccination is more important if potential exposure is in rural areas and if adequate postexposure care is not readily available. Vaccination should be considered for persons staying longer than 3 weeks, adventurous eaters, and those who will venture off the usual tourist routes into small cities, villages and rural areas. Importance of vaccination increases as access to reasonable medical care becomes limited.
Contraindications depend on vaccine type.
On the left side of the page, select country profile, scroll down to the name of the country you want, double click on it, and read everything you could want to know about travel to that country. A final decision regarding immunizations will be based on the traveler's medical history, proposed itinerary, duration of stay and purpose for traveling. Especially consider choosing active immunization for persons planning to reside for a long period or for persons who take frequent short-term trips to risk areas. The importance of protection against hepatitis A increases as length of stay increases. Annual outbreaks occur in the Chiang Mai Valley, and cases occasionally occur in Bangkok suburbs.