Overseas travel can sometimes carry the risk of exposure to disease or other health risks. In general it's advised that you stay informed of any precautions or medical requirements for your specific destinations.
Some countries require certain immunizations before allowing entry. In other cases immunization may be requested, but not required. It is always a good idea to travel with a first aid kit containing appropriate medicines and remedies for your specific destination.
Consult your physician before your trip and use the following web site links for accurate updated information:
World Health Organisation
International Travel and Health References