 New York and New Jersey are seeing increased cases of the dengue virus as cases rise around the world. The Centers for Disease Control says nearly 200 people there have been infected this year. Other cases have been confirmed in Puerto Rico, Florida, New York, Massachusetts, California, Colorado, Arizona, and D.C. Viruses carried by mosquitoes that thrive in warm climates. Symptoms include fever, aches, nausea, vomiting, and rash.