Skip to Main Content

Table 2 shows the relationship between the presence of Legionella and the temperature of the samples collected from hot water distribution systems. Most of the water samples positive for L. pneumophila colonization were related to temperature higher than 30 °C (samples ≥30 °C n = 39, samples <30 °C n = 2, p < 0.00001). In particular, while this observation is generally valid for sports centers and camp sites, both cold and hot samples collected from hotels showed the same level of contamination by Legionella.

Table 2

Distribution of samples positive for Legionella pneumophila in relationship with the temperatures measured during the sampling

 Total samplesThermal characterization of samplesb
Samples positive for L. pneumophila by thermal characterization at the sampling
p-valuea
Number< 30 °C≥ 30 °C< 30 °C, number (%)≥ 3 0°C, number (%)
Sports centers 92 84 0 (0%) 32 (38%) 0.0471 
Camping sites 22 17 0 (0%) 2 (40%) 0.0433 
Hotels and holiday farmhouses 34 12 22 2 (17%) 5 (23%) 1.000 
Beach resort and amusement park 12 12 0 (0%) n.a n.a 
Total 160 49 111 2 (4%) 39 (35%) <0.00001 
 Total samplesThermal characterization of samplesb
Samples positive for L. pneumophila by thermal characterization at the sampling
p-valuea
Number< 30 °C≥ 30 °C< 30 °C, number (%)≥ 3 0°C, number (%)
Sports centers 92 84 0 (0%) 32 (38%) 0.0471 
Camping sites 22 17 0 (0%) 2 (40%) 0.0433 
Hotels and holiday farmhouses 34 12 22 2 (17%) 5 (23%) 1.000 
Beach resort and amusement park 12 12 0 (0%) n.a n.a 
Total 160 49 111 2 (4%) 39 (35%) <0.00001 

ap-value as for Fisher's exact test for comparison in each facility type studied the <30 °C vs ≥30 °C samples for the identification of L. pneumophila.

n.a.: not applicable.

bTemperature of the samples collected from hot water distribution systems.

Close Modal

or Create an Account

Close Modal
Close Modal