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Volume 10, Number 3—March 2004

Research

Legionella Infection Risk from Domestic Hot Water

Paola Borella*Comments to Author , M. Teresa Montagna†, Vincenzo Romano-Spica‡§, Serena Stampi¶, Giovanna Stancanelli#, Maria Triassi**, Rachele Neglia*, Isabella Marchesi*, Guglielmina Fantuzzi*, Daniela Tatò†, Christian Napoli†, Gianluigi Quaranta‡, Patrizia Laurenti‡, Erica Leoni¶, Giovanna De Luca§, Cristina Ossi#, Matteo Moro#, and Gabriella Ribera D’Alcalà**
Author affiliations: *University of Modena and Reggio E., Modena, Italy; †University of Bari, Bari, Italy; ‡Catholic University in Rome, Rome, Italy; §University Institute of Physics Sciences, Rome, Italy,; ¶University of Bologna, Bologna, Italy; #S. Raffaele Hospital, Milan, Italy; **University Federico II of Naples, Naples, Italy

Main Article

Table 3

Characteristics of Legionella contamination in the examined domestic hot water

Characteristic Legionella spp. total L. pneumophila serogroup 1 L. pneumophila serogroups 2–14 Other Legionella species
Positive samples
n (%)
33/146 (22.6)
6/33 (18.2)
19/33 (57.6)
8/33 (24.2)
Count (CFU/L)
Geometric mean 1.17 × 103 0.96 × 103 0.94 × 103 2.30 × 103
Median 1.85 × 103 0.89 × 103 1.85 × 103 3.16 × 103
5th percentile 54 100 25 100
95th percentile
4.1 × 104
5 × 103
3 × 104
8.8 × 104
Distribution n (%)
1–9.9×102 CFU/L 15/33 (45.4) 3/6 (50.0) 9/19 (47.4) 3/8 (37.5)
103–9.9 × 103 CFU/L 15/33 (45.4) 3/6 (50.0) 8/19 (42.1) 4/8 (50.0)
>104 CFU/L 3/33 (9.2) 0/6 (0.0) 2/19 (10.5) 1/8 (12.5)

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