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Quebec City Legionnaires outbreak

Published: March 24th, 2013

Revised: March 24th, 2013

In the summer of 2012, a significant outbreak of Legionnaires Disease occurred in Quebec City resulting in 181 cases and 13 deaths.

This week, the CBC’s premier French language investigative documentary program, L’Enquête, examined the public health response to the outbreak. L’Enquête spoke with Dr. Scott to learn about Legionella and the issues around its management.

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Temporal variation in airborne microbial populations and microbially-derived allergens in a tropical urban landscape

Published: March 23rd, 2013

Revised: July 21st, 2014


The microbial component of outdoor aerosols was assessed along a gradient of urban development from inner-city to rural in the seasonal-tropical metropolis of Hong Kong. Sampling over a continuous one-year period was conducted, with molecular analyses to characterize bacterial and eukaryal microbial populations, immunoassays to detect microbially-derived allergens and extensive environmental and meteorological observations. The data revealed bioaerosol populations were not significantly impacted by the level of urban development as measured by anthropogenic pollutants and human population levels, but instead exhibited a strong seasonal trend related to general climatic variables. We applied back-trajectory analysis to establish sources of air masses and this allowed further explanation of urban bioaerosols largely in terms of summer-marine and winter-continental origins. We also evaluated bioaerosols for the potential to detect human health threats. Many samples supported bacterial and fungal phylotypes indicative of known pathogenic taxa, together with common indicators of human presence. The occurrence of allergenic endotoxins and beta-glucans generally tracked trends in microbial populations, with levels known to induce symptoms detected during summer months when microbial loading was higher. This strengthens calls for bioaerosols to be considered in future risk assessments and surveillance of air quality, along with existing chemical and particulate indices.

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