NCLEX Infection Control: Standard, Contact, Droplet, and Airborne Precautions

Two tiers: one for every client, one added by route

CDC's Guideline for Isolation Precautions sorts infection prevention into two tiers. Standard Precautions apply to all patients in every healthcare setting, whether or not an infection is suspected. Transmission-Based Precautions (Contact, Droplet, and Airborne) are added for a patient who is known or suspected to be infected or colonized with an agent that Standard Precautions alone would not contain. CDC is explicit that the added category never replaces the first tier: Transmission-Based Precautions are always used in addition to Standard Precautions, and some infections need more than one category at once.

That two-tier shape answers a lot of NCLEX items before you recall any organism. A choice that puts on a gown for Contact Precautions but skips hand hygiene, or masks for Droplet Precautions but shares an unclean blood pressure cuff, is incomplete.

Where infection control sits in the 2026 NCLEX-RN Test Plan

The 2026 NCLEX-RN Test Plan has a content area titled "Standard Precautions/Transmission-Based Precautions/Surgical Asepsis" inside Safety and Infection Prevention and Control. Its examples include understanding communicable diseases and the modes of transmission (airborne, droplet, contact), applying infection prevention principles such as hand hygiene, isolation, and aseptic and sterile technique, reporting a communicable disease according to policy, teaching clients and staff, using precautions for immunocompromised clients, setting up a sterile field, and evaluating the precautions and aseptic technique of staff.

Two limits keep this honest:

• The 10–16% range for Safety and Infection Prevention and Control covers the whole category, which also includes injury prevention, restraints, security plans, and error reporting. NCSBN publishes no separate share for isolation questions, and an individual exam's mix can differ by up to 3 percentage points per category.
• Infection content also appears elsewhere. Physiological Adaptation lists caring for a client with an infectious disease and evaluating the response to treatment (the plan's examples are AIDS and tuberculosis), and Management of Care lists reporting communicable diseases as required by law.

The NCLEX Test Plans page lists the 2026 RN Test Plan as effective from April 1, 2026, through March 31, 2029, so it is the plan for every 2027 test date. For the whole map, see what to study for the NCLEX-RN.

Standard Precautions: the layer that never comes off

CDC bases Standard Precautions on the principle that blood, body fluids, secretions, excretions except sweat, nonintact skin, and mucous membranes may carry transmissible agents. They include:

• hand hygiene.
• gloves, gown, mask, eye protection, or face shield, chosen by the exposure you anticipate.
• safe injection practices.
• handling equipment so it does not spread infection, including cleaning and disinfecting or sterilizing reusable items before the next patient.
• respiratory hygiene and cough etiquette, such as masking a coughing person when tolerated and separating people with respiratory symptoms, ideally by more than 3 feet, in waiting areas.

CDC's own example of "anticipated exposure": a venipuncture may need only gloves, while an intubation calls for gloves, a gown, and a face shield or a mask with goggles.

When CDC calls for hand hygiene

The guideline lists these moments: before direct contact with a patient; after contact with blood, body fluids, mucous membranes, nonintact skin, or wound dressings; after touching a patient's intact skin; when moving from a contaminated body site to a clean one during care; after touching objects in the patient's immediate surroundings; and after removing gloves. Gloves never replace hand hygiene.

When hands are not visibly soiled, CDC prefers an alcohol-based hand rub. Wash with soap and water when hands are visibly dirty or soiled with blood or body fluids, and when contact with spores such as C. difficile is likely, because alcohol and other antiseptics have poor activity against spores.

To check whether these layers come automatically, practice Safety and Infection Prevention and Control questions with an explanation for every answer →.

Contact, Droplet, and Airborne Precautions compared

Each category changes four things: where the client stays, what staff put on before entering, how equipment is handled, and what happens when the client must leave the room. The details below come from CDC's 2007 guideline and its Appendix A, which CDC continues to update (most recently for a set of infections in September 2024).

Contact Precautions: gown and gloves, dedicated equipment

• Used for: agents spread by direct or indirect contact. Appendix A examples include C. difficile, scabies, RSV in infants, young children, and immunocompromised adults, and multidrug-resistant organisms where the infection control program calls for it. CDC also applies Contact Precautions when wound drainage, fecal incontinence, or other discharges cannot be contained.
• Room: a single-patient room when available. If rooms are short, CDC prioritizes patients whose condition favors spread (uncontained drainage, stool incontinence) and allows cohorting patients with the same pathogen.
• PPE: gloves and gown put on at entry, for any contact with the patient or potentially contaminated surroundings, and removed with hand hygiene before leaving the room.
• Equipment and transport: disposable or patient-dedicated noncritical equipment such as blood pressure cuffs, or cleaning and disinfection before another patient uses it. Transport only for medically necessary purposes, with infected areas contained and covered.

Droplet Precautions: a mask for close contact

• Used for: pathogens spread by respiratory droplets during close contact. CDC's examples include Bordetella pertussis, influenza virus, adenovirus, rhinovirus, Neisseria meningitidis, and group A streptococcus for the first 24 hours of antimicrobial therapy.
• Room: a single-patient room when available. No special air handling is needed. In a shared room, keep patients more than 3 feet apart and draw the curtain.
• PPE: a mask (a respirator is not necessary), generally put on at room entry.
• Transport: the client wears a mask and follows respiratory hygiene. CDC says no mask is required for the person transporting a client on Droplet Precautions.

Airborne Precautions: special air handling and a respirator

• Used for: agents that stay infectious over long distances in the air. CDC names measles, varicella (chickenpox), disseminated herpes zoster, and M. tuberculosis.
• Room: an airborne infection isolation room (AIIR) with monitored negative pressure, kept closed except for entry and exit. In acute care, a client who needs one when none is available is transferred to a facility that has one. In an outpatient setting without an AIIR, CDC says to mask the client and use a closed examination room.
• PPE: a fit-tested, NIOSH-approved N95 or higher-level respirator for suspected or confirmed infectious tuberculosis, put on before entry. For measles, CDC's current guidance asks staff to wear at least an N95-level respirator regardless of their own immunity, and susceptible staff should not enter when immune staff are available.
• Transport: the client wears a surgical mask outside the AIIR and skin lesions from varicella or draining tuberculosis lesions are covered. Staff transporting a masked client with covered lesions do not need a mask or respirator.

Once the three categories are clear, test placement, PPE, and transport choices on exam-style questions in full NCLEX-RN prep →.

Precautions start before the diagnosis is confirmed

CDC tells facilities to begin Transmission-Based Precautions from the clinical syndrome while laboratory results are pending, then adjust when the pathogen is identified or ruled out. Its Table 2 gives examples that read like NCLEX stems:

CDC notes that infection control professionals may adapt this table to local conditions. On the exam, a "suspected" infection is enough to start the matching precautions: an option that waits for a culture or smear before isolating is usually the unsafe one.

Duration and the exceptions that change an answer

Appendix A gives a duration for each condition, and a few are worth knowing because they change what the nurse does next:

• N. meningitidis: Droplet until 24 hours after effective therapy begins.
• Pertussis: Droplet until 5 days after effective antibiotic therapy begins.
• Varicella: Airborne plus Contact until the lesions are dry and crusted.
• Measles: Airborne until 4 days after the rash appears, or for the duration of illness in an immunocompromised client.
• C. difficile: Contact for the duration of illness, soap-and-water handwashing preferred, and no shared electronic thermometers.
• Norovirus: Contact for at least 48 hours after symptoms resolve.
• Suspected pulmonary tuberculosis: Airborne until infectious TB is judged unlikely and either another diagnosis explains the illness or three sputum smears for acid-fast bacilli are negative.

CDC also says to extend Contact or Droplet Precautions for immunosuppressed clients with viral infections, because shedding can last much longer.

Protective Environment and Enhanced Barrier Precautions

Two arrangements look like isolation but work differently:

• Protective Environment is for allogeneic hematopoietic stem cell transplant clients. It protects the client from the environment: HEPA-filtered incoming air, positive room pressure, at least 12 air changes per hour, and no dried or fresh flowers or potted plants in the room. The test plan's "precautions for immunocompromised clients" points here.
• Enhanced Barrier Precautions are CDC's nursing-home approach for residents with a multidrug-resistant organism, or with wounds or indwelling devices, when Contact Precautions do not otherwise apply. Staff wear a gown and gloves during high-contact care such as bathing, dressing, transferring, toileting, device care, and wound care, and residents are not restricted to their rooms. The 2026 test plan's infection-prevention examples include enhanced barrier precautions. CDC notes that these recommendations are being reviewed as part of the update to the 2007 isolation guideline, so check the current page before relying on details.

The PPE order CDC uses

CDC's poster gives one sequence for putting PPE on: gown, then mask or respirator, then goggles or face shield, then gloves.

For removal, its first example is gloves, then goggles or face shield, then gown, then mask or respirator, followed by hand hygiene immediately after all PPE is off. Everything comes off before leaving the room except a respirator, which is removed after leaving the room and closing the door. CDC's second example removes the gown and gloves together, and it says hand hygiene belongs between steps whenever hands become contaminated. CDC labels the outside of gloves and the front of the gown, goggles, and mask as contaminated, which is why each removal step avoids touching those surfaces.

If an item asks for the order, use these sequences. If it asks what was done wrong, look for touching a contaminated surface with bare hands or skipping hand hygiene at the end.

A worked isolation item

This is an original Passy practice item, not an NCLEX question.

A client is admitted with fever, a cough, and an upper-lobe infiltrate on the chest x-ray. Pulmonary tuberculosis has not been ruled out, and sputum smears are pending. Which plan should the nurse implement?

1. An airborne infection isolation room with the door closed, and a fit-tested N95 respirator put on before entering
2. A private room with the door open, and a surgical mask worn only when within 3 feet of the client
3. A semiprivate room with a roommate who also has a cough, and no mask until the smears return
4. Standard Precautions only until the first sputum smear result is reported to the unit

Key: 1. CDC lists this syndrome under empiric Airborne plus Contact Precautions, and it calls for an N95 or higher respirator when tuberculosis is suspected. Option 2 is a droplet-level plan that ignores air handling. Options 3 and 4 wait for confirmation, which the syndromic approach is designed to avoid. In practice the gown and gloves of Contact Precautions would also apply for this syndrome.

After items like this one, rehearse precaution decisions under time in the 85-question mock exam →.

How to study isolation precautions for the NCLEX

1. Learn the two tiers and the room, PPE, equipment, and transport rule for each of the three categories.
2. Learn the empiric syndromes in the table above, because NCLEX stems often describe a suspected infection.
3. Keep a short list of the durations that change an answer, instead of memorizing all of Appendix A.
4. For every miss, write which link of the chain you broke: route, room, PPE, equipment, transport, or hand hygiene.

Then use the free NCLEX practice set for a mixed check. When several clients compete for attention, the NCLEX prioritization and delegation guide covers who comes first. For child-specific precautions, see NCLEX pediatrics, and for postoperative and adult-health infection cues, see NCLEX med-surg.

In clinical practice, follow your facility's infection prevention policy and current CDC or public health direction, which can be more specific than any study summary. When a precaution question keeps tripping you, bring missed isolation questions back for another try in full NCLEX-RN prep →.