Table 3

Legionella pneumophila determination in collaborative trial, Log (CFU/9 mL) (by participant no.)a
Culture results Immunomagnetic results
Level of spikingb Log10 CFU/9 mL Pill Culture count log10 CFU/9 mLc Estimated magnitude order log10 CFU/9 mL Qualitative resultsd
1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11
0 P6 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND A A A A A A A A A A A
P8 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND A A A A A A A A A A A
2.23 P4 2.83 2.22 2.21 2.47 2.57 2.11 2.38 2.23 2.73 1.98 2.32 3.0 <3.0 3.0 <3.0 <3.0 <3.0 2.0 2.0 3.0 2.0 3.0 P P P P P P P P P P P
P7 2.11 2.16 2.36 2.25 2.13 2.11 2.10 2.01 2.17 1.90 2.32 <4.0 <3.0 <4.0 <4.0 <3.0 3.0 3.0 2.0 <4.0 2.0 3.0 P P P P P P P P P P P
2.88 P1 3.07 2.86 3.12 3.19 3.04 1.99 2.99 2.96 2.69 2.78 2.85 4.0 3.0 3.0 <4.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 P P P P P P P P P P P
P3 3.13 2.90 3.11 3.13 3.07 2.29 2.61 2.51 2.77 2.57 2.77 3.0 3.0 3.0 <4.0 3.0 2.0 3.0 2.0 <4.0 3.0 3.0 P P P P P P P P P P P
3.82 P2 4.01 4.23 4.03 3.93 3.76 3.59 3.49 3.56 3.21 3.59 4.22 4.0 >4.0 >4.0 <4.0 4.0 >4.0 4.0 3.0 4.0 >4.0 4.0 P P P P P P P P P P P
P5 3.92 4.20 4.30 3.64 3.63 3.94 3.77 3.66 3.97 3.61 3.95 4.0 4.0 4.0 4.0 4.0 >4.0 4.0 3.0 4.0 >4.0 >4.0 P P P P P P P P P P P
P9 3.33 4.20 3.91 3.89 3.92 3.71 3.48 3.63 3.97 2.91 3.99 4.0 4.0 4.0 4.0 4.0 >4.0 >4.0 >4.0 3.0 4.0 4.0 P P P P P P P P P P P

a This table includes only results from participating laboratories that were not excluded due to obvious deviation from the trial protocol.

b Concentrations calculated from the results provided by the 11 participating laboratories, assigned to the used reference materials (pills).

c ND, not detected.

d A, absence; P, presence.

Bedrina et al.

Bedrina et al. BMC Microbiology 2013 13:88   doi:10.1186/1471-2180-13-88

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