“(CNN) Eleven former guests at a prominent Atlanta hotel have now been diagnosed with Legionnaires’ disease while an additional 55 probable cases have also been linked to the same outbreak, officials said.

“Probable cases” are people who have symptoms of the disease, including diagnosed pneumonia for some, but without laboratory confirmation.

Medical investigators have not yet found the source of the bacterial infection that causes Legionnaires‘ — a serious form of noncontagious pneumonia, said Nancy Nydam, director of communications at Georgia Department of Public Health.

“Based on epidemiological evidence we have an outbreak among people who stayed at the (Sheraton Atlanta) during the same time period,” she said. Guests who complained of lung problems and were later diagnosed with Legionnaires’ had attended a convention at the Atlanta hotel a couple of weeks ago.”

To read the full article click here.