When calls started coming in to the Alabama Department of Public Health from concerned parents who reported illnesses in adults and children after a local softball tournament, the state launched an investigation into the outbreak.
Most people are exposed to legionella regularly and usually don't get legionellosis, but people with weak immune systems are typically more susceptible to the disease.
Most people get infected by inhaling the bacteria. It can't be transferred by person to person contact.
"It can be found in the water in systems like swimming pools, hot tubs, cooling towers, fountains, especially the ornamental fountains that spray water. It can even be associated with people doing stuff in their yards with hoses and sprinklers," explained Dr. Mary McIntyre, State Epidemiologist.
There are no statewide requirements for specific testing when it comes to public pools and only eight counties in Alabama have local pool regulations.