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.
Those most at risk of getting sick from Legionella infection include people who are smokers, have chronic lung disease or weak immune systems, and people over the age of 65.
Twelve cases of the disease have been reported in the Anaheim area; among those, eight people had visited Disneyland in September and one worked there, the Register reports. Ten of the 11 ill were hospitalized, and one person died. That person did not visit Disneyland, she said.
Legionnaires' can cause severe pneumonia.
"There is no known ongoing risk associated with this outbreak", the health care agency said in a statement.
Disneyland has shut down two cooling towers that were found to have high levels of Legionella bacteria after several visitors to the theme park in Anaheim, Orange County, the United States, were sickened with Legionnaires' disease.
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The towers are near the New Orleans Square Train Station, more than 100 feet away from parts of the theme park accessible to guests, a Disneyland Resort spokeswoman said Friday, the Los Angeles Times reported. Good's email statement didn't indicate if any of those who contracted the disease were related to each other.
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.
According to the OCHCA, the Legionnaire's disease exposure period ranged from September 12 to September 27, Hymel said, adding that Disney thoroughly reviewed all regular water testing for the resort, "including work performed by contracted third-party experts", and "implemented additional redundant testing of other cooling towers on our property".
On Tuesday, Disney took the towers down again because the health agency ordered them to verify they were free of the Legionella contamination.
It takes 2 to 10 days for symptoms of Legionnaires' disease to appear.
There have been 55 reports of Legionella disease in Orange County residents through October of 2017; 53 were reported for the entire year of 2016; and 33 in 2015, according to Good.