The mosquito-borne disease has raged in South America and other regions for several months.
Twenty-one countries and territories of the Americas have reported cases of the virus since Brazil reported the first cases of local transmission in May 2015, WHO’s regional office for the Americas said in a statement.
“Aedes mosquitoes — the main vector for Zika transmission — are present in all the region’s countries except Canada and continental Chile,” the statement said.
The Centers for Disease Control and Prevention urged pregnant women to postpone travel to Bolivia, Brazil, Cape Verde, Colombia, Ecuador, El Salvador, French Guiana, Guadeloupe, Guatemala, Guyana, Haiti, Honduras, Martinique, Mexico, Panama, Paraguay, Saint Martin, Suriname, Samoa, Venezuela and Puerto Rico. The CDC also recommended that women who have recently traveled to these places during their pregnancy be screened and monitored for the virus.