Singapore said on Friday it had found 38 more people who had contracted Zika, raising to 189 the number infected with the mosquito-borne virus since authorities reported the first locally transmitted case six days ago.
Some of the new cases had been detected in areas where infections had not previously been reported, the health ministry said in a statement.
The ministry did not specify the locations, but the virus has been spreading daily beyond an initial cluster.
Singapore, a regional financial centre and transit hub, is the only Asian country with active transmission of the virus.
On Thursday, it said the case load had jumped to 151 infections, including two pregnant women.