The charge nurse on a medical unit reviews isolation precautions at 0700. Room 1: an adult with no immunocompromising condition has herpes zoster in one thoracic dermatome, with the lesions covered by a dressing. Room 2: a client receiving chemotherapy has zoster lesions on the trunk, both arms, and the face. Room 3: a client with meningococcal meningitis has received IV ceftriaxone since 0100 yesterday. Room 4: a client with pulmonary tuberculosis has completed 14 days of four-drug therapy; yesterday's sputum smear was positive for acid-fast bacilli. Room 5: a client admitted at 0200 has had four loose stools; a C. difficile test was sent at 0600. Which decisions by the charge nurse are correct? Select all that apply.

Quick answer
Standard precautions only in Room 1, stop droplet precautions in Room 3, and start contact precautions in Room 5 (options 2, 4, 6).

Why this is correct
Each decision requires reading the room data. Room 1 has localized zoster in one dermatome, the lesions are covered, and the client is not immunocompromised, so standard precautions are enough. Room 3 started ceftriaxone at 0100 yesterday, which is 30 hours before 0700 today, beyond the 24 hours of effective therapy after which droplet precautions can stop. Room 5 has new diarrhea and a pending C. difficile test, so contact precautions begin now instead of after the result.

Easy analogy or mental picture
Isolation is like a traffic light that changes with the data: extent of rash, hours of antibiotics, and smear results turn it green or keep it red, not the diagnosis name alone.

Memory hook
Zoster: one covered dermatome = standard; spread or immunocompromised = airborne plus contact. Meningococcus: 24 hours of therapy. TB: negative smears, not days of therapy.

NCLEX decision rule
Match precautions to the organism's route, the extent of disease, the client's immune status, and objective criteria for ending isolation, and start empiric precautions while tests are pending.

Why the other choices are wrong
Contact precautions only for Room 2 (option 1) is tempting because zoster usually spreads by contact with lesions, but disseminated zoster, or zoster in an immunocompromised client, requires airborne plus contact precautions. Ending airborne precautions in Room 4 (option 3) is tempting because 2 weeks of effective therapy is a commonly taught milestone, but this client's sputum smear is still positive, so isolation continues until clinical improvement and negative smears. Assigning a nurse without varicella immunity to Room 1 (option 5) is tempting because Room 1 needs only standard precautions, but susceptible staff should not provide care to any client with zoster when immune staff are available.