Inoculation (CFU/surface) Replicates PDX-LIB UVM-USDA χ2
Presumptive Positives Confirmed positives Confirmed positives
Lm 21 1.50E+05 20 9 9 2 2.92
Lm 42  1.30E+05 20 16 16 1 11.5
Lm & EF on3Stainless steel  2.50E+04 20 18 18 3 10.7
Lm 464 1.60E+04 20 10 10 0 6.33
Lm 10 &Ec5 onSealed concrete 7.20E+02 20 9 9 0 5.51
Table 2: Summary of methods comparison between PDX-LIB and UVM-USDA.