Microorganisms grow when they have the right nutrients and conditions for growth. Bacteria need these conditions to grow:
Food
high protein foods are often contaminated at the time of purchase. Using safe food practices destroys the bacteria. Acidity: bacteria prefer low-acid environments. Some bacteria do survive an acidic environment.
Bacteria use an enormous range include various sugars and either carbohydrates, amino acids, sterols, alcohols, hydrocarbons, inorganic salts and carbon dioxide.
Time
Potentially hazardous foods should not remain in the danger zone for more than four hours during the entire food handling process.
Temperature
The temperature danger zone is 40 degrees F to 140 degrees F.
Oxygen
Many bacteria grow bets in the present of oxygen (aerobic organism). Some bacteria grow without oxygen- anaerobic. However, both types of bacteria cause foodborne illness.
Others grow equally well under either aerobic or anaerobic conditions.
Moisture
Bacteria grow best in a moist environment.
A high proportion of the mass of a bacterium is water, and during growth, nutrients and waste products enter and leave the cell. Bacteria can grow only in or on materials which have adequate free or available water.
pH
Most bacteria grow best at near pH7 (neutral), and the majority cannot grow under strongly acidic or strongly alkaline solution.
Growth conditions for bacteria