
The Centers of Disease Control has all the information you will need know prior to an international trip. In regard to Ghana, they recommend adults get the intramuscular form of polio as immunity appears to wane with oral polio. Also, they recommend that adult who have received Tetanus & Diphtheria receive the Tetanus, Diphtheria, and Pertussis as the latter is a significant problem in Ghana. Tuberculosis also appears to be prevalent and travelers are instructed how to avoid placing themselves at risk.
In addition to the medical information, immunizations, and medications, they receive a travel advisory which includes information on the country's political situation, personal safety, travel conditions (auto) in the area and other social situations.