Microbiology
The reaction(s) that is/are usually positive in Escherichia coli, is/ are

Indole reaction
All of these
Methyl red reaction
Glucose fermentation

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Microbiology
Which of the following is true to prevent botulism from smoked fish?

Fish should be immediately frozen after packaging and kept frozen
All of these
The fish should be heated at its coolest part to at least 82°C for 30 min during or after smoking
Good sanitation should be maintained throughout production and handling

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