LAKE ANNA, Va. (CBS19 NEWS) -- The Virginia Department of Health has completed another round of water testing at Lake Anna after the E. coli outbreak over Memorial Day weekend, and officials confirm that there is no public threat, but they don't recommend people get in the water.

The samples used for the testing were collected four weeks after the Memorial Day weekend and don't necessarily reflect the water environment when people got sick.

Results also can't predict future risk, and swimming in any natural body of water poses some health risks because the water is not disinfected.

The health department will be on high alert and monitor the public more than usual through July 17 because of Fourth of July celebrations.