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Which of the following class consists of microorganisms which are not causative agents?

(a) EFB Class 1

(b) EFB Class 2

(c) EFB Class 3

(d) EFB Class 4

I got this question in an online interview.

I need to ask this question from Types of Bioreactors in chapter Recovery and Purification of Fermentation Products, Effluent Treatment, Bioreactor Design Considerations of Fermentation Technology

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Right choice is (a) EFB Class 1

To elaborate: Microorganisms that have never been identified as causative agents of disease in man are termed as harmless microorganisms and belong to EFB Class 1 and do not offer a threat to the environment.

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