| factors contributing to the contamination of hospital water distribution systems by legionellae. | to identify factors associated with the contamination of hospital water distribution systems by legionellae, 84 quebec hospitals provided 3284 hot water specimens from 839 different sites. concentrated samples were seeded on buffered charcoal yeast extract agar and a semi-selective medium. at least one water sample was contaminated by legionellae in 57 hospitals (67.9%). in 22 hospitals (26.2%), greater than 30% of samples were contaminated by these bacteria. in 9 (12.2%) of 74 hospitals, distil ... | 1992 | 1538162 |
| risk factors for contamination of domestic hot water systems by legionellae. | to assess risk factors associated with the contamination of the domestic environment by legionellae, 211 houses in the quebec city area were randomly selected and water samples were collected from the hot water tank, the shower heads, and the most frequently used faucet. after centrifugation, concentrated samples were seeded in triplicate on bcye and gpv media. data on the characteristics of the hot water system and plumbing in the house and on the personal habits of the occupants were collected ... | 1991 | 1768104 |
| ecological distribution of legionellaceae in the quebec city area. | one hundred environmental water samples, which were collected in the quebec city area and cultured on buffered charcoal yeast extract medium and three selective media, were inoculated to guinea pigs and were screened by direct immunofluorescent staining (dfa) for the presence of legionellaceae. six isolates were made (four legionella pneumophila and two tatlockia (legionella) micdadei: three by animal inoculation and three by culture). no samples were simultaneously positive by both methods. aft ... | 1984 | 6713304 |
| investigation of legionnaire disease in a long-term care facility--quebec. | | 1998 | 9704538 |
| antibacterial properties of a glycolipid-rich extract and active principle from nunavik collections of the macroalgae fucus evanescens c. agardh (fucaceae). | this study investigated the antibacterial activity of glycolipid-rich extracts of the brown macroalga fucus evanescens in cell culture. accessions were collected on the arctic coast of ungava bay, nunavik, quebec. the crude ethyl acetate extract of these accessions showed strong antibacterial activity (≥4 log(10) cfu) against hemophilus influenzae , legionella pneumophila , propionibacterium acnes (atcc and clinical isolate), and streptococcus pyogenes at 100 µg/ml. this algal extract inhibited ... | 2011 | 21859295 |
| genomic characterization of a large outbreak of legionella pneumophila serogroup 1 strains in quebec city, 2012. | during the summer of 2012, a major legionella pneumophila serogroup 1 outbreak occurred in quebec city, canada, which caused 182 declared cases of legionnaire's disease and included 13 fatalities. legionella pneumophila serogroup 1 isolates from 23 patients as well as from 32 cooling towers located in the vicinity of the outbreak were recovered for analysis. in addition, 6 isolates from the 1996 quebec city outbreak and 4 isolates from patients unrelated to both outbreaks were added to allow com ... | 2014 | 25105285 |
| molecular typing of legionella pneumophila isolates in the province of quebec from 2005 to 2015. | legionella is found in natural and man-made aquatic environments, such as cooling towers and hot water plumbing infrastructures. legionella pneumophila serogroup 1 (lp1) is the most common etiological agent causing waterborne disease in the united states and canada. this study reports the molecular characterization of lp strains during a 10 year period. we conducted sequence-based typing (sbt) analysis on a large set of lp isolates (n = 284) to investigate the province of quebec sequence types ( ... | 2016 | 27706210 |
| early radiographic and tomographic manifestations of legionnaires' disease. | legionnaires' disease (ld) may occur sporadically or in the course of outbreaks, where the typical radiological manifestations of the disease may better be delineated. we took advantage of a rare community-based epidemic of ld (181 patients) that occurred in 2012 in quebec city, canada, to describe the radiographic features of ld and compare the its tomographic presentation with that of community-acquired pneumonia caused by common bacteria other than legionella pneumophila. | 2017 | 28479105 |