LUBBOCK, Texas (AP) — A cooler-than-normal spring has slowed the breeding season for mosquitoes, but experts warn this doesn’t mean that Texans should let down their guard when it comes to protecting themselves from the West Nile virus.

The threat of West Nile virus this summer is unknown. So far, the state’s health department has had no reports of it in humans, though mosquitoes with the virus have been found in Harris, Montgomery and Dallas counties.