To keep pathogens away from the area of the host is known as "prevention" or "containment." In a broader context, it can also refer to "biosecurity measures," which are practices aimed at preventing the introduction and spread of infectious diseases. In medical and healthcare settings, "asepsis" or "aseptic technique" is used to maintain a sterile environment to protect the host from pathogens.
To keep the pathogens away from the area of the host is known as
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