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Table 3 shows the concentrations of L. pneumophila load found in all monitored facilities. In nearly all samples, they ranged from ≥103 to <105 CFU/L, but in three samples, taken in sports centers, the contamination was >105CFU/L.

Table 3

Distribution of samples positive for Legionella by bacterial load and serotype

 Samples positive for L. pneumophilaL. pneumophila load (CFU/L)
L. pneumophila serotype
Number≥ 10 3– < 104≥ 10 4– < 105≥ 105Ser 1 (%)Ser 2–14 (%)Mixed (%)
Sports centers 32 13 16 6 (18.8) 21 (65.6) 5 (15.6) 
Camping sites 2 (100) 0 (0) 0 (0) 
Hotels and holiday farmhouses 2 (28.6) 4 (57.1) 1 (14.3) 
Beach resort and amusement park n.a n.a n.a n.a n.a n.a 
p-valuea  0.3218 0.1457 
Total 41 18 20 10 25 
 Samples positive for L. pneumophilaL. pneumophila load (CFU/L)
L. pneumophila serotype
Number≥ 10 3– < 104≥ 10 4– < 105≥ 105Ser 1 (%)Ser 2–14 (%)Mixed (%)
Sports centers 32 13 16 6 (18.8) 21 (65.6) 5 (15.6) 
Camping sites 2 (100) 0 (0) 0 (0) 
Hotels and holiday farmhouses 2 (28.6) 4 (57.1) 1 (14.3) 
Beach resort and amusement park n.a n.a n.a n.a n.a n.a 
p-valuea  0.3218 0.1457 
Total 41 18 20 10 25 

aChi-square for trend for all groups’ comparison.

n.a.: not applicable.

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