County health officials say 12 people contracted the lung disease, including one Disneyland employee, with one person who had not visited the park ultimately dying. People who are particularly susceptible to the disease are older adults, smokers, and people with weakened immune systems.
Nine of the afflicted had visited the park, with the others living or traveling in Anaheim.
The victims were aged between 52 and 94.
There has been one death - the person had not visited the theme park.
"We conducted a review and learned that two cooling towers had elevated levels of Legionella bacteria", Hymel said in the release.
A total of a dozen cases of the bacterial lung infection were discovered in Anaheim, California about three weeks ago, the Orange County Health Care Agency announced Friday.
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The outbreak was traced to the convention hotel's air conditioning system, and Legionnaire's disease has since been sourced to contaminated water or mist.
Disney took the towers out of service again on Tuesday because the health agency required they remain down until test results verify they are free of Legionella contamination.
No other cases of the disease have been reported since September.
The towers, in question, are located in the backstage area near the New Orleans Square Train Station, each more than 100 feet from the areas accessible to visitors.
Most cases of the infection start when people inhale microscopic water droplets containing legionella bacteria. Disneyland was informed of the cases October 27, chemically treating and voluntarily shutting down two cooling towers to rid them of the Legionella bacteria, said Walt Disney Parks and Resorts Chief Medical Officer Pamela Hymel.
It is treated with antibiotics, which can improve symptoms and shorten the length of illness. The towers were chemically treated to combat the problem, and there is no ongoing threat to guests' health, the Register reports. Disney took the towers out of service on November 1, performed more testing and disinfection, and brought them back into service on November 5.