Public Health declares end of Legionellosis outbreak in Stoney Creek, East Hamilton

Hamilton Public Health has declared the outbreak of Legionellosis in East Hamilton and Stoney Creek over.

Between May 4 and May 26 of this year 22 laboratory-confirmed cases of legionellosis associated with the outbreak were reported to the health unit.  All of the cases resulted in hospitalization.

Hamilton Public Health (HPH) says that the cases ranged in age from their late 30s to early 90s.

Given that no additional cases were reported to HPH between May 26 and June 27, the outbreak has been declared over.

Hamilton Public Health reports that it carried out a “comprehensive investigation that included the assessment of nearby cooling towers and other potential sources that can release fine water droplets into the air outdoors.”

Although no confirmed source was identified, the time since cases have been reported suggests the risk of exposure has decreased, says HPH.

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In investigations of legionellosis outbreaks, a specific source of exposure is not always identified, despite investigating and testing potential sources and a thorough review of where exposure may have occurred, explains the health unit.

“While a specific source may not be identified, follow-up has been done with operators of cooling towers and other potential sources that can release fine water droplets into the air to remind them to ensure that systems are in proper working order and maintained appropriately,” reads a statement from HPH.

“Prevention is our most effective tool when it comes to reducing the risk of Legionellosis exposure,” said Dr. Brendan Lew, Associate Medical Officer of Health.

“As temperatures rise and cooling towers are brought back into seasonal operation, residents and facility operators of water systems should ensure their equipment is properly maintained and operated. Regular inspection, cleaning and maintenance help prevent the growth of Legionella bacteria and play an important role in protecting the health and safety of our community,” Dr. Lew added.

Hamilton Public Health says that it will continue to monitor for and investigate reported cases of Legionellosis, and engage with operators, and municipal and provincial partners to reduce the risk in the city.