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  • Title: Growth and survival of Escherichia coli O157:H7 during manufacture and storage of Indian cheese (paneer).
    Author: Wahi S, Bansal S, Ghosh M, Ganguli A.
    Journal: Foodborne Pathog Dis; 2006; 3(2):184-9. PubMed ID: 16761944.
    Abstract:
    The growth and survival of Escherichia coli O157:H7 during manufacture and storage of Indian cheese or paneer was investigated. Pasteurized and raw milk that had been inoculated with 10(4) CFU/mL of E. coli O157:H7 cultures were used for manufacturing paneer samples which were vacuum-packaged and stored at 4 degrees C, 8 degrees C, and 28 degrees C. Survival and growth of E. coli O157:H7 in paneer samples was determined after every 4 h for up to 48 h. Escherichia coli O157:H7 could survive the manufacturing process of paneer and were present at the end of the storage period (at 28 degrees C) in significantly (p < 0.05) greater numbers than the initial inoculum. No significant difference in survival and growth were noticeable in paneer samples manufactured from raw milk. Though refrigeration (4 degrees C or 8 degrees C) effectively inhibited the growth of E. coli O157:H7, this pathogen could survive over a period of 48 h. Our observations suggest that unpasteurized or improperly pasteurized milk could be an important source for transmission of E. coli O157:H7 through paneer, and appropriate steps must be taken by government agencies to ensure consumer safety for this dairy product.
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