The outbreak has led to 177 recorded cases. Officials believe the illness is under control because no one has become sick since Aug. 29.
Public-health authorities say the illness has been brought under control because they have disinfected the cooling systems in more than 100 buildings.
The deadly bacteria grows in the stagnant water of cooling systems and spreads in little droplets through air conditioning.
The last of the 177 recorded cases was reported Wednesday.
An investigation is looking into the specific source, or sources, of the outbreak. The findings are not expected before mid-October.
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