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- Where do the different types of coliforms come from?While it is true that not all coliforms are pathogenic under normal conditions, please name two situations that can occur due to infection by pathogenic strains.Why must the top agar be supplemented with maltose? A) Maltose allows for binding of the phage to the E. Coli and aids in the infection process B) Maltose helps stabilize the phage within the media