By the time the 48-year-old man showed up at a clinic in New York City he had been sick for almost two weeks. A blotchy, red rash still blanketed his torso and his body ached. He had just gotten over a triple-digit fever, intense lower back pain and a painful eye infection. Five weeks earlier he had embarked on a long vacation to South America and Polynesia but during his trip he had felt fine. He had hopscotched from country to country until he capped his stint through French Polynesia with a trip to Mooréa, an island about 16 kilometers northwest of Tahiti. The South Pacific paradise was teeming with some hungry mosquitos. But he wasn’t worried about the bites. He knew he was up on all his travel vaccinations.