Click on your destination region for a brief overview of the diseases that are present in some or all of the countries there, and the vaccinations that may be required.
Many countries in the same region have widely differing immunisation entry requirements - it is best to consult your travel agent or GP well before departure to ensure that you fulfil these.
The immunisations you need may be greatly influenced by the nature of your trip. For example, a trip only to urban areas in some countries may require less protection than a visit also involving rural areas. Your GP should be able to provide more information.