Infection Precautions

Infection Precautions: Contact vs Droplet vs Airborne

Master the differences between contact, droplet, and airborne precautions to protect patients and pass the NCLEX. Learn PPE requirements, room assignments, and high-yield diseases.

Understanding the differences between contact, droplet, and airborne precautions is essential for NCLEX success. These transmission-based precautions are used in addition to standard precautions to prevent the spread of specific infections. The NCLEX frequently tests your ability to identify the correct precaution type for a given condition.

NCLEX Tip:

Memorize the precaution type for high-yield conditions: MRSA (contact), TB (airborne), influenza (droplet), and C. difficile (contact + soap and water). These appear frequently on the exam.

Overview of Transmission-Based Precautions

Transmission-based precautions are additional measures used for patients with known or suspected infections. They are always used in addition to standard precautions. The type of precaution depends on the route of transmission of the infectious agent.

Precaution TypeTransmission RouteKey PPERoom Requirements
ContactDirect or indirect touchGloves, GownPrivate room or cohort
DropletLarge respiratory droplets (<3 feet)Surgical maskPrivate room or cohort
AirborneSmall droplet nuclei (long distance)N95 respirator or PAPRNegative pressure room (AIIR)

Contact Precautions

Contact precautions are used for infections spread through direct or indirect contact. This includes touching the patient, their belongings, or surfaces contaminated with the infectious agent.

Key Requirements

  • Gloves: Required for all patient contact and contact with patient environment
  • Gown: Required when substantial contact with patient or contaminated surfaces is anticipated
  • Room: Private room preferred; cohorting with same diagnosis is acceptable
  • Equipment: Dedicated equipment (e.g., blood pressure cuff, stethoscope) for patient use only

Diseases Requiring Contact Precautions:

  • MRSA (Methicillin-resistant Staphylococcus aureus)
  • VRE (Vancomycin-resistant Enterococcus)
  • C. difficile (Clostridioides difficile)
  • Scabies
  • Impetigo
  • Herpes simplex (mucocutaneous, disseminated)
  • Draining wounds (infected)
  • Pediculosis (lice)
  • RSV (Respiratory Syncytial Virus) — in infants and young children

Special Note: C. difficile

For C. difficile, you must use soap and water for hand hygiene, not alcohol-based hand sanitizer. C. difficile forms spores that are resistant to alcohol. Mechanical friction from hand washing physically removes the spores from your hands.

Droplet Precautions

Droplet precautions are used for infections spread by large respiratory droplets generated when an infected person coughs, sneezes, talks, or undergoes certain procedures. These droplets travel short distances (typically <3 feet) and do not remain suspended in the air.

Key Requirements

  • Mask: Surgical mask required when within 3 feet of the patient
  • Room: Private room preferred; cohorting with same diagnosis is acceptable
  • Transport: Patient wears surgical mask during transport
  • Door: May remain open; negative pressure not required

Diseases Requiring Droplet Precautions:

  • Influenza
  • COVID-19 (SARS-CoV-2)
  • Pertussis (whooping cough)
  • Mumps
  • Rubella (German measles)
  • Meningococcal meningitis
  • Group A Streptococcus (pharyngitis, pneumonia, scarlet fever)
  • Adenovirus

Airborne Precautions

Airborne precautions are used for infections spread by small droplet nuclei that can travel long distances on air currents and remain suspended in the air for extended periods. These require the most stringent isolation measures.

Key Requirements

  • Respiratory Protection: N95 respirator or PAPR required — must be fit-tested
  • Room: Airborne Infection Isolation Room (AIIR) with negative pressure required
  • Door: Must remain closed at all times
  • Transport: Patient wears surgical mask during transport; minimize transport
  • Room Entry: Only essential personnel; limit time in room

Diseases Requiring Airborne Precautions:

  • Tuberculosis (TB, pulmonary or laryngeal)
  • Measles (Rubeola)
  • Varicella (Chickenpox)
  • Herpes zoster (Disseminated shingles in immunocompromised patients)

Special Consideration: Shingles (Herpes Zoster)

  • Localized shingles in immunocompetent patient: Contact precautions only (cover lesions)
  • Disseminated shingles: Airborne and contact precautions
  • Any shingles in immunocompromised patient: Airborne and contact precautions

PPE Donning and Doffing Sequence

The NCLEX frequently tests the correct order for donning and doffing PPE. Memorize these sequences.

Donning (Putting On) PPE Sequence:

  1. Gown — tie at neck and waist
  2. Mask or respirator — secure ties, fit to face
  3. Goggles or face shield — adjust to fit
  4. Gloves — pull over gown cuffs

Doffing (Removing) PPE Sequence:

  1. Gloves — using glove-in-glove technique
  2. Gown — untie waist then neck, roll inside out
  3. Goggles or face shield — touch only earpieces/headband
  4. Mask or respirator — touch only ties, not front
  5. Hand hygiene — immediately after removing all PPE

NCLEX Clinical Scenarios

Question 1: A nurse is caring for a client with active pulmonary tuberculosis. Which personal protective equipment should the nurse wear when entering the client's room?

  • A. Surgical mask and gloves
  • B. N95 respirator and gown
  • C. N95 respirator, gown, and gloves
  • D. Surgical mask, gown, gloves, and goggles

Answer: C. N95 respirator, gown, and gloves

Rationale: TB requires airborne precautions. The nurse must wear an N95 respirator (fit-tested) for respiratory protection. Gown and gloves are required as part of standard precautions and for potential contact with infectious material.

Question 2: A client is admitted with suspected meningococcal meningitis. The nurse should implement which type of precautions?

  • A. Contact precautions
  • B. Droplet precautions
  • C. Airborne precautions
  • D. Protective isolation

Answer: B. Droplet precautions

Rationale: Meningococcal meningitis is spread by large respiratory droplets. Droplet precautions require a surgical mask within 3 feet of the patient. The patient should wear a mask during transport.

Question 3: A nurse is removing PPE after caring for a client on contact precautions. Which action should the nurse take first?

  • A. Remove the gown
  • B. Remove the gloves
  • C. Perform hand hygiene
  • D. Remove the mask

Answer: B. Remove the gloves

Rationale: The doffing sequence is gloves, gown, goggles, mask, then hand hygiene. Gloves are removed first using the glove-in-glove technique to avoid contaminating yourself.

Key Takeaways for NCLEX Success

  • Memorize high-yield disease/precaution pairs: MRSA (contact), TB (airborne), influenza (droplet)
  • C. difficile requires soap and water: Alcohol sanitizer does not kill spores
  • Know PPE sequences: Donning = Gown, Mask, Goggles, Gloves; Doffing = Gloves, Gown, Goggles, Mask
  • Understand special cases: Shingles precautions depend on patient immune status and disease distribution
  • Room requirements matter: Airborne requires negative pressure; droplet and contact do not

Frequently Asked Questions

What is the main difference between droplet and airborne precautions?

Droplet precautions are for large respiratory droplets that travel short distances (<3 feet) and fall quickly. Airborne precautions are for small droplet nuclei that can travel long distances, remain suspended in air, and require special ventilation (negative pressure rooms) and respiratory protection (N95 respirators).

Why does C. difficile require soap and water instead of hand sanitizer?

C. difficile produces hardy spores that are resistant to alcohol-based hand sanitizers. The physical friction of hand washing with soap and water mechanically removes spores from the skin. This is why soap and water is mandated after caring for C. difficile patients.

Can a patient on airborne precautions share a room?

Generally, no. Airborne precautions require a negative pressure room (AIIR). In rare circumstances, patients with the same airborne infection (e.g., two TB patients) might be cohorted, but this requires approval from infection control. Never cohort patients with different airborne infections.

What type of mask does the patient wear during transport?

The patient wears a surgical mask during transport, regardless of precaution type. The N95 respirator is for healthcare providers entering an airborne precaution room. Patients do not wear N95s for transport because they are not designed for ill patients and may increase work of breathing.

When should I use both contact and airborne precautions?

Use combined precautions for diseases that spread through multiple routes. Examples include: disseminated herpes zoster (airborne + contact), varicella (airborne + contact), and COVID-19 during aerosol-generating procedures (airborne + contact + droplet). Always follow the most restrictive requirements.

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