According to federal health officials, the number of people infected by fleas, ticks, or mosquitos has tripled since 2004 and there are at least nine diseases that have been newly discovered or introduced here. There are our classic standbys Lyme disease and Zika, and if you live where it’s warm enough, dengue fever. Lyme disease can ruin you for life. The manager of a range at which I used to shoot, a big, strapping guy and a martial arts expert, caught it and was reduced to a shell of what he was. He never came back to his former self.