In response, the U.S. Centers for Disease Control and Prevention (CDC) has issued a warning for travelers headed to China and other countries dealing with outbreaks, including Bolivia, Kenya, Madagascar, Mauritius, Mayotte, Réunion, Somalia and Sri Lanka. Chikungunya can cause serious pain, especially in the joints.

U.S. health officials are warning travelers headed to southern China of an outbreak of chikungunya, a mosquito-spread disease that spurred a forceful response.