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Table 1 Legionella spp. colonization of hot and cold water samples examined from ferries water distribution systems

From: Legionella species colonization of water distribution systems, pools and air conditioning systems in cruise ships and ferries

No. of samples/total (%) Legionella spp. L. pneumophila serogroup 1 L. pneumophila serogroups 2–14 Legionella non pneumophila
Hot water samples     
No. of positive samples/total (%) 65/172 (37.8) 32/172 (18.6) 38/172 (22.1) 7/172 (4.1)
No. of samples with 500–999 CFU/L/total (%) 14/65 (21.5) 9/32 (28.1) 2/38 (5.3) 5/7 (71.4)
No. of samples with 103-9999 CFU/L/total (%) 31/65 (47.7) 19/32 (59.4) 20/38 (52.6) 1/7 (14.3)
No. of samples with ≥ 104 CFU/L/total (%) 20/65 (30.8) 4/32 (12.5) 16/38 (42.1) 1/7 (14.3)
Cold water samples     
No. of positive samples/total (%) 17/97 (17.5) 11/97 (11.3) 6/97 (6.2) 2/97 (2.1)
No. of samples with 500–999 CFU/L/total (%) 9/17 (52.9) 7/11 (63.6) 1/6 (16.7) 1/2 (50.0)
No. of samples with 103-9999 CFU/L/total (%) 7/17 (41.2) 4/11 (36.4) 4/6 (66.7) 1/2 (50.0)
No. of samples with ≥ 104 CFU/L/total (%) 1/17 (5.9) 0/11 (0.0) 1/6 (16.7) 0/2 (0.0)