The virus is linked to thousands of suspected cases of birth defects in Brazil. The new case is a 46-year-old woman whose partner was infected while in Haiti.
Chile, which does not have the mosquitoes that transmit the virus, has confirmed 10 cases of Zika involving people infected outside the country.
Growing evidence suggests a link between Zika and microcephaly in babies. The condition is defined by unusually small heads, which can result in developmental problems.
Brazil has confirmed 900 cases of microcephaly and considers most of them to be related to Zika infections in the mothers. U.S. health officials recommend that women wait at least two months, and men at least six, before attempting to conceive after infection with Zika.
The recommended waiting periods are the same for sexually active couples who are not trying to get pregnant.
There is no vaccine to prevent Zika virus and no medicine to treat it. Although Zika is generally spread by mosquitoes, it can also be sexually transmitted.