Mihara, Japan • March 2017
Legionella was detected in 39 people who complained of pneumonia-like symptoms after visiting an onsen in Mihara, Japan. An onsen is a Japanese hot spring and the bathing facilities and inns frequently situated around them. As a volcanically active country, Japan has thousands of onsens scattered throughout all of its major islands.
37 people were hospitalized, including a man in his 50s who has died. The onsen has indoor and outdoor bathing facilities supplied by hot spring water at approximately 45 degrees C and an adjoining inn with hot spring baths in each guest room. It was closed on March 21.