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OTTAWA, Ontario (AP) — Canada’s Public Health Agency is telling pregnant Canadian women who visited Miami-Dade and Broward counties in Florida on or after June 15 to take precautions against the Zika virus.

The warning comes after U.S. health officials said mosquitoes have apparently started spreading Zika on the U.S. mainland.

Chief Public Health Officer Dr. Gregory Taylor said Tuesday because four million Canadians visit Florida annually, an unknown number could be affected by the latest U.S. discovery.

Taylor says any pregnant women who visited the area on or after June 15 should see their health care providers for testing.

He says women who have been to the region should wait two months before trying to become pregnant. And because the virus can linger in sperm, men should wait several months longer.