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Table 1 Results of the microbiological analysis performed on the water samples collected

From: Legionella on board trains: effectiveness of environmental surveillance and decontamination

  Pre-decontamination period Post-decontamination period Total
Number of water samples analysed 679 (54.538% of total samples analyzed) 566 (45.462% of total samples analyzed) 1245
Number of samples positive for Legionella spp. 394 (58.027%) 242 (42.756%) 636
Number of samples positive for L. pneumophila 1 220 (55.838%) 177 (73.140%) 397
Number of samples positive for L. pneumophila 2 -14 75 (19.036%) 39 (16.116%) 114
Number of samples positive for L. pneumophila 1 and 2 -14 99 (25.127%) 23 (9.504%) 122
Number of samples positive for Legionella other species 0 (0.000%) 3 (1.240%) 3
Number of samples with load values < 100 CFU/L 69 (17.513%) 14 (5.785%) 83
Number of samples with load values 100–999 CFU/L 155 (39.340%) 121 (50.000%) 276
Number of samples with load values 1,000-9,999 CFU/L 138 (35.025%) 85 (35.124%) 223
Number of samples with load values ≥ 10,000 CFU/L 32 (8.122%) 22 (9.091%) 54