Microbiology
The technique(s), used for the assay of heat-labile enterotoxin produced by Escherichia coli, is/are

All of these
Morphological changes in Chinese hamster ovary
Steroid production in Yl mouse adrenal cell culture
Enzyme-linked immunosorbent assay

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

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