The Sample6 DETECT/L solution that is added to the sample before incubation is NOT an enrichment media. The Sample6 DETECT/L solution (phage/buffer mixture) added to the sponge/swab is designed to help any cells present recover from sanitizers and other environmental stresses. At the same, the phage is on a seek and destroy mission looking specifically for Listeria cells. Listeria will be lysed by the phage, which acts as an anti-microbial specifically for Listeria. In addition, broad range anti-microbials are included in the detection solution to address other bacteria that may also be present in the sample. For these reasons enrichment of any bacteria during the incubation period is not likely to occur.