Security researchers who attended the Black Hat and DEFCON security conferences in Las Vegas at the start of the month and stayed at the Caesars Palace Hotel and Casino should be aware that cases of Legionnaires' disease had been reported among hotel guests.

https://www.southernnevadahealthdistrict.org/news-release/southern-nevada-health-district-conducting-legionnaires-disease-investigation-at-caesars-palace-hotel-and-casino/