A woman protects her child's face in Managua, Nicaragua, as health workers fumigate for mosquitoes that carry chikungunya. The virus started spreading through Nicaragua and Mexico in the fall. Esteban Felix/AP hide caption

itoggle caption Esteban Felix/AP

Marqui Ducarme is aided by his wife after catching chikungunya at his home in Port-au-Prince, May 23. The virus swept through Haiti this spring, infecting more than 40,000 people. Marie Arago/Reuters/Landov hide caption

itoggle caption Marie Arago/Reuters/Landov

Sick with chikungunya, Karla Sepulveda, 5, waits in a public hospital with her grandmother in Boca Chica, Dominican Republic, on May 15. The Caribbean nation has reported more than 100,000 cases this year. Ezequiel Abiu Lopez/AP hide caption

itoggle caption Ezequiel Abiu Lopez/AP

Sun, shopping and chikungunya? A nasty virus has sickened 10 people on the island of St. Martin in the past few months. Balalaika/iStockphoto hide caption

itoggle caption Balalaika/iStockphoto