These tables are intended to assist in thinking through a differential diagnosis by syndrome for different CCMDs. Note that many of the agents below are rare and may be only localized to a specific region of the CCMD. The tables are not 100% comprehensive (pathogens that cause very common syndromes such as upper respiratory tract infections, sexually transmitted infections, etc. are limited to conserve space) and many organisms can cause multiple clinical syndromes and have not been repeated multiple times in some cases to be succinct. For most up to date information recommend referencing the latest medical intelligence from National Center for Medical Intelligence, information from Armed Forces Health Surveillance Division and other resources noted in Appendix D. Due to the speed of international travel imported diseases can be brought from one geographic region to another rapidly. Thus, taking a complete travel and exposure history is extremely important.