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A hypothesis
There are only two types of hygiene. These two types of hygiene are categorized as good hygiene and poor hygiene.
Hygiene risk is the risk of bad hygiene in a kitchen and environment
Personal hygiene has to do with hygiene about yourself, clean hands, etc...
Enviromental hygiene has to do with hygiene around your work area (kitchen area), rats, mould, etc...
Total hygiene is the target hygiene. In which you get no infection of any kind.