Dr. John Cahill explains that a number of tropical diseases, if left unrecognized or untreated, can have devastating outcomes. Unfortunately, he sees this on a daily basis. There are people who return from their travels with serious viral or parasitic infections. In good hands, it can be very easily treated, but without seeking the correct care or going to a physician who doesn't understand the implications of these diseases, they can be misdiagnosed or missed. (Read more about The Challenges of Overseas Medical Evacuations)