Though the largest outbreaks of Zika have been in Latin American and Caribbean countries, there have also been cases of the virus, which can be transmitted by mosquitos, reported in parts of Southeast Asia. Until recently, however, those have been isolated instances.
That changed last week, when confirmed cases of Zika in the city-state of Singapore rose to 82.
In response, the Centers for Disease Control and Prevention has issued an advisory recommending that pregnant women not travel to Singapore, because the virus can cause microcephaly in newborns (symptoms are mild for most everybody else who gets the disease).
In addition to the warning from the U.S., Australia, Taiwan, and South Korea have also advised their citizens to be careful about visiting Singapore, which gets about 15 million tourists each year.