The World Health Organization said Monday that the number of confirmed cases of Zika in the United States jumped to more than 3,000, a nearly 20 percent increase over a month ago.
That was an all-time high, but not nearly as high as the peak of more than 10,000 cases recorded last October.
The United States has not yet reported a case of Zika virus.
The WHO said it was also able to confirm a second case in Puerto Rico, which is the U.S. territory closest to the Dominican Republic.
The virus has been spreading in the Dominican, Dominican Republic and Cuba.
The country of over 1.6 million people, which has experienced a series of hurricanes and droughts, has seen no new cases of the virus since September.
Puerto Rico was also hit hard by Hurricanes Maria and Irma in October and November.
Hurricane Maria struck on Sept. 30, killing at least 40 people.
The previous week, a devastating hurricane swept through Puerto Rico killing at most 4,000 people.
President Donald Trump, a Republican, has promised to send Puerto Rico millions of dollars in federal aid.