Viable counts of culturable bacteria obtained from leafy salad vegetables. Samples were plated on TSA (A) and R2A (B) media and are baby spinach, romaine lettuce, red leaf lettuce, iceberg lettuce, and green leaf lettuce of conventionally (C) and organically (O) grown varieties. Subsamples of each type were also subjected to surface sterilization (s) prior to processing. Counts represent means (+/− SE) of three analytical replicate plates per sample.
Jackson et al. BMC Microbiology 2013 13:274 doi:10.1186/1471-2180-13-274