12/07/2012 05:28 EST | Updated 02/06/2013 05:12 EST

Six people in Calgary ill with legionnaires' disease, officials tracking source

CALGARY - Health authorities in Calgary are investigating an outbreak of legionnaires' disease.

Six people fell ill between Nov. 18 and Nov. 23 and required hospitalization.

Officials are tracking the source of the exposure and believe the potentially deadly bacteria came from somewhere in the community.

Thirteen people died following an outbreak of legionnaires' disease in Quebec City earlier this year.

The source was later identified as a cooling tower in a city office building.

The bacteria grows in water and can be passed to humans through air conditioners, showers, fountains, humidifiers and hot tubs.