What are some of the infections that are most commonly associated with international travel?

The main categories are food-borne illness, mosquito-borne illness and respiratory illness. With mosquito-borne illness, the major diseases we worry about are malaria and yellow fever. From a food-borne transmission perspective, probably the biggest concerns, with regard to incidence, are traveler's diarrhea, hepatitis A and typhoid. Respiratory illnesses, such as influenza or colds, are actually the second-most common cause of illness while abroad.