We have found an interesting article for you from the history of Janské Lázně and the treatment of polio.
“After the end of the war, Janské Lázně has received a worldwide response to the success of polio treatment . The Marshal Plan is to build a new spa complex. After the events of February 1948 , however, for political reasons this does not happen, although some excavation works have already begun. During this period, some hotels and boarding houses changed into a trade union convalescent home , where a large number of workers were recruited annually. The former village of Černá Hora and Janské Lázně were merged.”
You can find the article here: