ROUND ROCK, Texas - A sixth case of Legionnaires' disease has been discovered at a Round Rock hotel.

The Williamson County and Cities' Health District say the latest pneumonia case involves a former guest of Marriott's Springhill Suites.

The hotel on Hoppe Trail has been closed since last week as the situation is investigated. 

Officials said the first five people affected had spent time at the hotel since June.

The hotel is working with a third-party company to fix the problem and stop the spread of the rare disease.