When would Koch's postulates be utilized?

When would Koch's postulates be utilized? 



A. determination of the cause of a patient's illness in a hospital microbiology lab
B. development of a new antibiotic in a pharmaceutical lab
C. determination of the cause of a new disease in a microbiology research lab
D. formulation of a vaccine against a new pathogen in a genetic engineering lab
E. whenever the scientific method can not be used to investigate a microbiological problem






Answer: C


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