MIC 320 Final: Final different layout
1 Dec 2016
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Can be 10 - 106 cells/in2 depending on moisture level. Major sites for food contamination by food handlers: nasal and hand boils. Facultative ph 4. 0-9. 8 (optimal ph 6-7) aw > 0. 86 (some may grow as low as 0. 83. Not psycotroph so you can keep in the refrigerator. Common phenotypes coagulase and thermostable nuclease positive (for staphylococcus aureus) Not reliable; should be looking for enterotoxin production. A, b, c1, c2, c3, d, e, g, h, i, j, k, & l. Develop within 2-6 hours after ingestion of enterotoxin. Severe cases: headache, muscular cramping, marked prostration, lowered body temperature, low blood pressure; occasionally death. Dink a lot of water to maintain fluid balance; rest. Foods made by hand and improperly refrigerated after preparation. Ready to eat foods should be tested for total counts of staphylococcus aureus. Act as superantigen that mediates cross- linkage between t cell receptor (cd4+ t cells) and class ii mhc (antigen presenting cells).
