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20 to 40 degree's
It depends on species; most bacteria develop rapidly between 20 and 40°C. Those that are pathogenic to humans are normally cultivated around body temperature, 37±3°C for fast analysis.

Most bacteria stop growing at temperatures close to 0°C. Also most bacteria die at about 70°C, but there are pathogenic bacteria that need 121°C to be killed off.

Refrigerators shall have max 8°C temperature to reduce bacterial growth, 2°C for storing of fish (hence ice boxes are used). Food shall be warmed above 70°C fast and cooled rapidly to below 8°C to according to EU rules for cooking.

There are though extreme environment bacteria e.g. thermophile ones that thrive in heat. In freezing environments many bacteria go to a kind of hibernation mode, as "spores", where they survive but don't reproduce. The kryophiles like temperatures even below 0°C, where some even reproduce.

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