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Legionella spp. in Polish hospitals in 2009–2013 and 2014–2016: An epidemiological analysis

Iwona Gładysz
Iwona Gładysz
, 
Agnieszka Sikora
Agnieszka Sikora
, 
Małgorzata Wójtowicz-Bobin
Małgorzata Wójtowicz-Bobin
 and 
Jan Karczewski
Jan Karczewski
   | Feb 05, 2021
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Article Category: Original Article
Published Online: Feb 05, 2021
Page range: 85 - 90
Received: Apr 14, 2020
Accepted: Oct 30, 2020
DOI: https://doi.org/10.5604/01.3001.0014.7249
Keywords
© 2021 Iwona Gładysz et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Prevalence of L. pneumophila SG 1 and SG 2-14 in the analyzed hospitals
Prevalence of L. pneumophila SG 1 and SG 2-14 in the analyzed hospitals

Levels of water contamination by Legionella [9]

Number of Legionella spp. in 100 ml of hot water Assessment of contamination
<100102 lack/minimal (GROUP A)
>100102–103 medium (GROUP B)
>1000103–104 high (GROUP C)
>10 000>104 very high (GROPUP D)

Comparison of the mean number of L. pneumophila colonies (CFU) isolated from water samples in 2009–2013 and 2014–2016

Year Total number of water samples Mean number of L. pneumophila CFU Median Standard deviation (SD) Standard error (SE)
2009–2013 4747 2574 77 119 102
2014–2016 2765 1541 118 381 192

Number of hot water samples tested in 2014–2016 according to accepted criteria of contamination

Year Number of water samples GROUP A number/percentage of all water samples GROUP B number/percentage of all water samples GROUP C number/percentage of all water samples GROUP D number/percentage of all water samples
2014 832 542 (65.2%) 187 (22.5%) 85 (10.2%) 18 (2.1%)
2015 711 518 (72.9%) 142 (19.9%) 46 (6.5%) 5 (0.7%)
2016 1222 901 (73.7%) 172 (14.2%) 134 (10.9%) 15 (1.2%)
Total samples in 2009–2013 2765 1961 (71.0%) 501 (18.1%) 265 (9.6%) 38 (1.3%)

Mean number of L. pneumophila colonies isolated from hot water samples in 2009–2013

Year Number of water samples Mean number of L. pneumophila colonies (CFU/100 ml) Median Standard deviation (SD) Standard error (SE)
2009 610 7134 150 481 525
2010 985 1316 98 346 350
2011 1052 921 60 263 264
2012 1642 3165 79 195 157
2013 458 333 25 120 170
Values for the period 2009–2013 Total: 4747 2574 77

Number of hot water samples tested in 2009–2013 according to accepted criteria of contamination

Year Number of water samples GROUP A number/percentage of all water samples GROUP B number/percentage of all water samples GROUP C number/percentage of all water samples GROUP D number/percentage of all water samples
2009 610 433 (71%) 108 (17.8%) 56(9.1%) 13(2.1%)
2010 985 827 (84%) 110 (11.1%) 43 (4.4%) 5 (0.5%)
2011 1052 920 (87.5%) 82 (7.8%) 47 (4.5%) 3 (0.2%)
2012 1642 1393 (84.9%) 160 (9.7%) 82 (5%) 7(0.4%)
2013 458 394 (86.0%) 55 (12.0%) 9 (2.0%) 0
Total samples in 2009–2013 4747 3967 (83.6%) 515 (10.8%) 237 (5%) 28 (0.6%)

Mean number of L. pneumophila colonies isolated from hot water samples in 2014–2016

Year Number of water samples Mean number of L. pneumophila colonies (CFU/100 ml) Median Standard deviation (SD) Standard error (SE)
2014 832 1611 79 405 359
2015 711 859 110 277 263
2016 1222 2153 210 449 352
Values for the period 2014–2016 Total: 2765 1541 118 381 192
eISSN:
1732-2693
Language:
English
Publication timeframe:
Volume Open
Journal Subjects:
Life Sciences, Molecular Biology, Microbiology and Virology, Medicine, Basic Medical Science, Immunology
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