The 2016 Zika epidemic, which causes birth defects when pregnant women are exposed to the virus, has been declared over by health authorities in the Caribbean island of Puerto Rico.
The Puerto Rico health department issued a statement on Monday saying there's been about 10 reports per four week period of the mosquito-borne virus since April, a significant drop from the 8000 cases that were reported each month at the epidemic's peak in August 2016.
But the US Centers for Disease Control and Prevention (CDC) has not changed its travel advice and says pregnant women should not travel to Puerto Rico.
"At this time, there are no plans to change CDC's travel recommendations for Puerto Rico. The agency is reviewing recent surveillance data and will update recommendations based on review of data," CDC spokesman Tom Skinner said in a statement.
On its website, the CDC cites public health reports saying that "mosquitoes in Puerto Rico are infected with Zika virus and are spreading it to people."
CDC acting Director Anne Schuchat issued a statement saying she is "pleased that the peak of the Zika outbreak in Puerto Rico has come to a close."
However, she said, "We cannot let our guard down."
A major outbreak of Zika began in Brazil in 2015 and spread rapidly to dozens of countries. There is no treatment for Zika, but private companies and governments are working on a vaccine.
In addition to Puerto Rico, the CDC warns there is a risk of Zika infection for travellers going to Mexico, Cuba, most of the Caribbean and South America, as well as parts of Africa and Southeast Asia.
Locally transmitted Zika cases have also been reported in Texas and Florida.
