7 cases of Legionnaires’ disease are now tied to Las Vegas’ Rio hotel. 29 more cases are suspected. In addition, there have been 56 suspected cases of Pontiac fever at the hotel. The outbreak was first reported in June. The hotel’s water system continues to be cleaned and tested. Legionnaires’ spreads when water droplets in the air containing the Legionella bacteria are inhaled. Prompt treatment with antibiotics usually cures Legionnaires’, but left untreated it can be fatal.