Orange County health officials said nine people who visited the Anaheim theme park in September developed the disease.
According to a report from The Orange County Register, officials are investigating 12 cases of Legionnaires' disease that were contracted by people from or visiting the Anaheim area.
Nine of the visitors had visited Disneyland Park in September before developing the illness, according to the paper, citing the Orange County Health Care Agency.
"Legionnaires' disease is not contagious, can not be transmitted person to person, and comes from a bacteria that is naturally in the environment, usually in water", says Dr. Hymel.
Symptoms develop 2 to 10 days after exposure, the OCHCA said, and include fever, chills, cough, muscle aches, and headaches.
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The remaining three were Orange County residents who did not visit the park but lived or traveled in Anaheim.
The towers traced to the outbreak were located near the New Orleans Square Train Station, both towers more than 100 feet from public areas.
ANAHEIM, CA - DECEMBER 13: Walt Disney and Mickey Mouse Statue at Disneyland's Sleeping Beauty's Holiday Castle and "Believe In Holiday Magic" Fireworks spectacular held at Disneyland Resort on December 13, 2007 in Anaheim, California.
The bacteria often spreads though water vapor or mist, and older people or those with compromised immune systems are most susceptible. A Disneyland employee is among those who got sick. People can contract the disease by breathing in small droplets of water in the air that contain the Legionella bacteria. One patient, who hadn't visited the park, has died.
According to a LA Times report, Disney reported on November 3 that routine testing had detected elevated levels of Legionella in two cooling towers a month earlier, and the towers had been disinfected. On Nov. 1, more testing and disinfection was performed and the towers were brought back into service on Nov. 5. Disney independently chose to take the towers out of operation the day before, Good said. The towers will reopen once they are no longer contaminated, park officials said.