Mysterious “brainworm” epidemic: 16 people died in the 1960s just going for a swim
Vrbensky Spa. In the first half of the 1960s, an aggressive disease appeared in North Bohemia that cost the lives of sixteen young people, including children. They died of purulent inflammation of the brain and meninges. For a long time, doctors and scientists didn’t understand why. The only thing that connected the victims was a visit to a swimming pool in Ústí nad Labem shortly before their deaths. The mystery was not solved until ten years later.
Source https://aktualne.cz/foto-smrtici-epidemie-mozkozrouta-v-usti-nad-labem/