Health officials in San Francisco said Tuesday that there have been 25 reported cases of the Zika virus in The City, though none of the cases have been transmitted locally.

There is a known risk of Zika infection in Latin America and the Caribbean, while present to a lesser extent in southeast Asia. According to Director of Health Barbara Garcia’s report to the Health Commission, all of the Zika patients in San Francisco are returning travelers.

The first case of the Zika virus in The City was reported March 3, the San Francisco Examiner previously reported.

Some mosquitoes are believed to spread the virus, which causes symptoms like fevers, joint pain and red eyes. The virus has also been linked to birth defects and has been found especially in pregnant women returning from travel.

The virus is also circulating among mosquitoes in Florida, according to the report.