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.

The Centers for Disease Control and Prevention (CDC) issued a travel advisory Friday, warning of a chikungunya outbreak in Guangdong province, southeast China, with most cases reported in Foshan city.

"Vaccination is recommended for travelers who are visiting an area with a chikungunya outbreak. Two chikungunya vaccines are approved for use in the United States," the CDC noted. There are special concerns for pregnant women, according to the U.S. government.