Infection control on the NCLEX: standard, contact, droplet and airborne precautions, from CDC's own guidance

Standard precautions apply to every client. On top of them, CDC adds contact precautions (gown and gloves), droplet precautions (a mask on entry) and airborne precautions (a fit-tested N95 or higher respirator in a negative-pressure room), depending on how an infection spreads.

Published September 19, 2026

Infection control is tested under Safety and Infection Prevention and Control, which is 10 to 16% of the NCLEX-RN under the 2026 test plan. The plan asks candidates to understand how organisms are transmitted, naming airborne, droplet and contact, and to apply standard precautions, isolation and aseptic technique. Everything clinical on this page comes from the Centers for Disease Control and Prevention, mainly its 2007 isolation precautions guideline and the current pages built on it.

Hospitals write their own policies on top of CDC guidance, and a facility may be stricter than anything here. Where CDC's own pages disagree with each other, which happens on one point below, we show both.

Standard precautions apply to everyone

CDC's standard precautions rest on the assumption that blood, body fluids, secretions, excretions other than sweat, nonintact skin and mucous membranes may all carry infection. They cover hand hygiene, personal protective equipment whenever exposure to infectious material is expected, respiratory hygiene and cough etiquette, patient placement, cleaning of equipment and surroundings, handling of laundry, and safe injection practices, including a sterile single-use needle and syringe for every injection.

The three transmission-based precautions

Precaution	What staff wear	Room	CDC examples
Contact	Gown and gloves for any contact with the client or their surroundings	Single room if available	C. difficile, scabies, and drug-resistant organisms such as MRSA where the facility's infection program requires it
Droplet	A mask on entering the room	Single room if possible	Pertussis, Neisseria meningitidis, influenza
Airborne	A fit-tested NIOSH-approved N95 or higher respirator	Airborne infection isolation room at negative pressure	Tuberculosis, measles
Airborne and contact together	Respirator plus gown and gloves	Airborne infection isolation room	Chickenpox, disseminated shingles

When a client on droplet precautions has to leave the room, CDC advises putting a mask on the client. For airborne precautions, CDC also says staff who are not immune should stay out of the room of a client with measles, chickenpox or disseminated shingles when immune staff are available.

How long precautions last

CDC sets a duration for each condition, and these tend to appear on the exam as questions about when a precaution can stop. The durations below are from Appendix A of CDC's guideline and, for influenza, CDC's current influenza guidance for health care settings.

Condition	Precautions	Until
Pulmonary or laryngeal tuberculosis, confirmed	Airborne	Improving clinically with three consecutive negative sputum smears for acid-fast bacilli, collected on separate days
Measles	Airborne	4 days after the rash begins
Chickenpox	Airborne and contact	Lesions are dry and crusted
Pertussis	Droplet	5 days after effective antibiotics start
Neisseria meningitidis	Droplet	24 hours after effective therapy starts
Scabies	Contact	24 hours after effective therapy starts
C. difficile	Contact	Duration of illness
Influenza	Droplet	7 days after onset, or 24 hours after fever and respiratory symptoms resolve, whichever is longer

C. difficile and hand hygiene

Alcohol hand sanitizer does not kill C. difficile spores, and on that CDC is consistent. Its older Appendix A describes handwashing with soap and water as preferred for that reason. CDC's current clinical page goes further and says handwashing alone may not remove all the spores, which is why it stresses gloves and a gown for every visit, even a short one. On an exam question, the answer that avoids relying on alcohol sanitizer is the safe one.

Putting on and removing PPE

CDC's PPE sequence poster gives the order for putting equipment on: gown, then mask or respirator with a fit check, then goggles or a face shield, then gloves pulled over the cuffs of the gown. Removal is where contamination happens, and CDC shows two acceptable methods.

Removing PPE, CDC example 1	Removing PPE, CDC example 2
1. Gloves	1. Gown and gloves together
2. Goggles or face shield	2. Goggles or face shield
3. Gown	3. Mask or respirator
4. Mask or respirator	4. Hand hygiene
5. Hand hygiene

In both methods, CDC says to remove everything before leaving the room except a respirator, which comes off after you are outside. It also says to perform hand hygiene between steps if your hands become contaminated, and immediately after all the equipment is off.

Enhanced barrier precautions

The test plan names enhanced barrier precautions alongside standard ones, as the 2023 plan already did. CDC designed them for nursing homes: gown and gloves during high-contact care such as bathing, dressing, transferring, toileting, wound care and care of devices like central lines, urinary catheters and feeding tubes. They apply to residents with a drug-resistant organism when contact precautions do not apply, and to residents with wounds or indwelling devices whatever their status, and CDC says staff change PPE before caring for another resident.

Practicing precaution questions

Precaution questions reward knowing the transmission route more than memorizing a list, because the route decides the equipment. Our NCLEX practice questions include precautions and PPE questions across client scenarios, and the 2026 test plan guide shows where this category sits among the eight. For the related skill of choosing which client to see first, see prioritization and delegation questions.

Our NCLEX-RN practice is built on the April 2026 test plan, with unfolding case studies and every Next Gen question type. Sit a full adaptive exam free, with no email or card.

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