Susceptible
A host who lacks sufficient immunity or resistance to a specific pathogen and is therefore at risk of developing infection.
On the NCLEX, susceptibility shows up as a “who is most at risk” select-the-priority item: given several clients, pick the one whose defenses are weakest — the neutropenic chemo patient (ANC below 500), the older adult, the poorly controlled diabetic, or the malnourished post-op client. The other common stem asks which roommate assignment is safest for an immunocompromised host — never a client with any active infection or even a productive cough; a stable, non-infectious chronic condition is the safe pairing. The tell is that the question hinges on protecting the host, not containing an organism.
The classic trap is confusing the susceptible host with the other chain-of-infection links: infectious agent, reservoir, mode of transmission, and the portals of exit and entry. Reducing virulence isn’t your lever — boosting host resistance is. Equally tested: a protective environment keeps germs OUT (positive-pressure room) to shield the neutropenic patient, whereas an airborne infection isolation room keeps germs IN (negative-pressure room) to protect others. Mnemonic: “positive = protect the patient; negative = no escape.”
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