Those planning tours should be aware of potential diseases in areas of travel, and must refer to the Centers for Disease Control and Prevention website (www.cdc.gov) for immunizations that may be recommended or required. It is the responsibility of the trip organizers to inform all travelers in writing of such immunizations. If a traveler is a minor (under 18), a parent or legal guardian must be contacted by letter of any required or recommended immunizations. When immunizations are recommended, it is the responsibility of the student or employee to decide whether or not to receive them. The trip manager is responsible for ensuring required immunizations are received prior to travel.