Hygienists in the Czech Republic inspected water quality at natural bathing sites and issued the first bathing ban at Kachlička pond in Vysočina due to massive cyanobacteria presence, which poses a risk of acute health damage. Elevated cyanobacteria levels were also detected at other locations including Domanínský pond and Stříbrný pond in Malšovice. In the Moravian-Silesian region, cercaria parasites were confirmed in Brušperk reservoir, causing disease with symptoms such as skin redness, rash, and itching. In the Karlovy Vary region, water in Skalka reservoir and Velký Rybník has deteriorated quality at level three with cyanobacteria and chlorophyll content. Hygienists recommend monitoring current information on regional hygiene station websites and the www.koupacivody.cz portal.