Lecture+10+Staph%2C+Listeria%2C+and+Viruses+_color_

Lecture+10+Staph%2C+Listeria%2C+and+Viruses+_color_ - S...

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S. aureus, LISTERIA MONOCYTOGENES, Feb 1, 2012 FST104 Problems arise when food is left unrefrigerated for >4 hrs S. aureus transmission Grows on a variety of food but best on fatty foods (makes lipase for fat digestion) Handled food has high probability of contamination Keep food hot (>140°F, =60°C) Refrigerate (32-45°F/0-7°C)
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S. aureus tolerates high concentrations of salt S. aureus is salt tolerant Can grow at salt concentrations as high as 10% w/v NaCl (most bacteria do not grow) Salt tolerance =tolerance to desiccation (drying) Competitive edge in salty foods Ham Cured meats But it is Acid sensitive: Does not grow in acidic foods (e.g. mayonnaise) but can grow when acid is neutralized by tuna etc S. aureus foodborne outbreaks In 1989, 100 people in 3 states became ill with signs of S. aureus food intoxication Traced back to large cans of mushrooms Imported from China Mushrooms were properly canned and not contaminated after processing Farms Brokers Plant Export Weeks of storage in PVC bags Farms Plant Export (traditional) (modern agriculture)
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Sandwich Because Of Possible Health Risk 01/26/2012 10:10 AM EST M.E. Thompson, Inc. of Jacksonville, FL is recalling its Anytime Deli Turkey & Ham Sub Sandwich, UPC 0543200194, with an expiration date of January 19th and January 22nd because it has the potential to be contaminated with Listeria monocytogenes , an organism which can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened
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This document was uploaded on 04/03/2012.

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Lecture+10+Staph%2C+Listeria%2C+and+Viruses+_color_ - S...

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