Low heat processed meats.
This group of products consists of meats that are processed at temperatures of ~ 70 oC. The package may be hermetically sealed (air cannot pass) or not. They are stored at refrigerator temperatures (1-5 oC) and have shelf life of ~50 days. Initially, their microbial load is 10-100 org/gram. Psychrotrophic anaerobes can grow over long times. These products are adversely affected by:
– Temperature fluctuation
– High Aw
– High [Lipid]
– High pH
Raw and Pasteurized Milk
The normal microbial load of raw milk is < 1000 org/ml (immediately leaving the cow). This assumes healthy tissue and no infection of mammary tissue. In this case, the genera normally found are:
– Micrococcus,
– Streptocoocus,
– Corynebacterium
In unhealthy tissue, the following genera are often found:
– Staphylococcus aureus
– Pseudomonas species
Milk is stored at low temperatures (1-5 oC). In refrigerated storage, the following bacteria may grow:
– Pseudomonas_*******
– Flavobacterium
– Alcaligenes
– Coliforms
– Bacillus
– Yersinia entercolitica (Remember this one?)
– Listeria monocytogenes (And this one?)