Virginia Department of Health (VDH) has extended a swimming advisory for Lake Anna as a harmful algae bloom continues. The VDH cautioned this algae bloom is not connected to the Shiga toxin-producing Escherichia coli (STEC) outbreak that occurred after Memorial Day.
According to the VDH, some harmful algae, called cyanobacteria, can cause skin rashes and gastrointestinal illnesses. Algae blooms can occur when warm water and nutrients combine to make conditions favorable for algae growth. Most algae species are harmless; however, some species may produce irritating compounds or toxins. Avoid discolored water or scums that are green or bluish-green because they are more likely to contain toxins.