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Wrong storage
Ingredients and food must be stored at the right temperatures. It is also important to store food and non-food items separately.
Unsufficient cleaning
If food or drink residues remain after preparation, biofilms can form. Not only that, but bacteria are invisible until their colony is large enough to become visible.
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Expired food (which has already gone bad)
Bad packaging
Inadequately or incorrectly packaged food can become contaminated and spoil.
Wrong cooling
Bacteria can grow.
Personal hygiene
Transmission of pathogens via the hands due to poor hygiene.
Unsufficient preparation
Insufficient heating does not kill the bacteria. Rapid spoilage is possible.
ross-contaminatoin
Due to inadequate cleaning, bacteria can be transferred from one food item to another. This is called cross-contamination. For example, salmonella from chicken to salad.