Several regions across the United States have issued warnings about harmful blue-green algae blooms. In Pennsylvania, advisories for Lake Luxembourg and Lake Galena prohibit walking, wading, and swimming due to the presence of potentially toxic conditions. Similarly, Langlade County, Wisconsin, and Clay County, Florida, have advised residents to avoid contact with affected waters and to be vigilant for symptoms of exposure. Oklahoma's Arcadia Lake remains open, but visitors are cautioned to avoid areas with visible algae. Common symptoms from exposure include skin irritation, stomach pain, and vomiting, affecting both humans and animals. Health officials emphasize the importance of immediate medical attention if symptoms occur after contact with contaminated water.