As phagocytes or special cells cannot distinguish between pathogens so it is said that they engulf every pathogen present in the body . So my que is that, it is not necessary that all pathogens entering into the body are harmful some of them may be useful then are they also killed by these phagocytic cells?

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Solution

Pathogens are harmful bacteria which are not compatible with the body. The body detects any unknown harmful presence and the phagocytes kill such pathogens. Useful bacteria will be friendly with the body and it will not trigger phagocytosis. Phagocytes can distinguish between useful and harmful bacteria or other agents.

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