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Biology help

When a bacterium strain is injected with a digestive protein enzyme, how does this cause the bacterium strain to not cause damage to a human cell?
The digestive (hydrolytic) enzymes hydrolyse the cell wall of the bacterium and hydrolyse the RNA of the bacterium and its constituents, preventing it form proliferating or attempting to infect epithelial cells and then pass through to arteries and other tissues to circulate in the blood.

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