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About 108 retail and 101 field‐grown lettuce samples from across Beijing were examined. These samples were analyzed for their aerobic plate counts, coliform counts, fecal flora counts, and presence of pathogenic bacteria. Samples included retail leaf (n = 56), retail head (n = 52), field‐grown leaf (n = 54), and field‐grown head lettuce (n = 47). The number of aerobic colonies of retail leaf lettuce...
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