Summary of Awards to Date

Fate of Escherichia coli O157:H7 on fresh and fresh-cut iceberg lettuce and spinach in the presence of normal background microflora.

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Funding Agency

Center for Produce Safety


Mark Harrison, Ph.D.
University of Georgia


Hurst, W., and Kerr, W.


The objective of this study is to determine the ability of E. coli O157:H7 to multiply in the presence of normal background microorganisms on iceberg lettuce and spinach under conditions that mimic actual practices between production and retail sale, including: * Transportation from harvest field to cooler * Refrigerated storage * Transportation and distribution as (1) cored product in a nitrogen atmosphere (lettuce), (2) open 20-pound returnable plastic totes (spinach), or (3) finished packaged salads in a low oxygen/high carbon dioxide atmosphere in both common and abusive temperatures.