Eleven of those people visited Disneyland in September, said Orange County health agency spokeswoman Jessica Good.
The disease can be spread through inhaling droplets from contaminated water sources.
Officials reported the victims were infected sometime between August and October, and range between the ages of 52 to 94. While many people have no symptoms, it can cause serious pneumonia and prove risky to those with lung or immune system problems.
Health officials are now inspecting nearby properties and businesses which are not associated with theme park. The OCHCA said the cases were reported and verified by the agency between Sept. 27 and November 15, and the range of exposure dates is most likely late August/early September through late October.
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Five months after an outbreak of Legionnaires' disease was reported at the Rio, the number of confirmed cases of the pneumonia-like bacterial illness among guests has risen to seven, with 29 more cases suspected, the Southern Nevada Health District said Tuesday. Cooling towers are evaporative systems that provide cooled water for various uses such as refrigeration but not for drinking water.
The disease presents as pneumonia and includes symptoms such as high fever and cough.
All contracted Legionnaires' disease while staying at the hotel and there are more than two dozen other possible cases being investigated.
Neither individual who died visited Disneyland, according to the Register.
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The Los Angeles Times reports Thursday that Legionnaires' has sickened a total of 15 people, two of whom have died.
Authorities said two of the three new cases involved individuals who visited Disneyland. But officials are also focusing on the four patients who didn't visit the park as they track the source of the outbreak.
According to the CDC, Legionella is a type of bacterium found naturally in freshwater environments.
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