Infection Prevention and Control

1. Why Infection Prevention and Control Matters

Infection prevention and control (IPC) is a core nursing responsibility. It connects directly to what you learned in:

• Anatomy & Physiology: understanding how pathogens affect body systems (e.g., lungs in pneumonia, urinary tract in UTIs).
• Vital Signs & Bedside Assessment: early changes in temperature, heart rate, respiratory rate, and blood pressure often signal infection.

Why IPC is critical in 2026:

• Healthcare-associated infections (HAIs) still cause significant morbidity, mortality, and cost worldwide.
• COVID-19 (since 2019) highlighted how easily respiratory infections spread in healthcare.
• New and resistant organisms (e.g., MRSA, VRE, ESBL-producing bacteria, C. difficile) continue to emerge.

Nursing roles in IPC:

• Protect patients (especially the very young, elderly, immunocompromised, post-op, and ICU patients).
• Protect yourself and colleagues (occupational health and safety).
• Protect the wider community by preventing spread beyond the facility.

In this module you will:

• Map the chain of infection and see where nursing actions can break it.
• Distinguish standard vs. transmission-based precautions (contact, droplet, airborne).
• Apply hand hygiene and PPE concepts to real clinical scenarios.

2. The Chain of Infection: The Big Picture

The chain of infection describes how infections spread. If you break any link, transmission stops.

Most models include six links:

1. Infectious agent – the pathogen (bacteria, virus, fungus, parasite).
2. Reservoir – where the pathogen lives and multiplies (people, equipment, water, surfaces).
3. Portal of exit – how it leaves the reservoir (coughing, blood, urine, feces, wounds).
4. Mode of transmission – how it travels (contact, droplet, airborne, vector, common vehicle).
5. Portal of entry – how it enters a new host (mucous membranes, respiratory tract, broken skin, devices).
6. Susceptible host – a person with reduced defenses.

Key idea for nurses:

You rarely control the pathogen itself, but you can interrupt transmission at multiple links using:

• Hand hygiene
• PPE
• Safe injection and sharps practices
• Environmental cleaning
• Respiratory hygiene
• Isolation precautions

In the next steps, we’ll walk through each link and connect it to specific nursing actions.

3. Break the Chain: Thought Exercise

Imagine you are caring for a patient with influenza on a medical ward.

Scenario:

• The patient has a fever, cough, and sore throat.
• They cough into their hand, then touch the bed rails and call bell.
• You enter the room to take vital signs.

Your task: For each link in the chain of infection, write down one nursing action to break it.

Use this template in your notes:

```text

1. Infectious agent (influenza virus):

• Action:

1. Reservoir (patient, contaminated surfaces):

• Action:

1. Portal of exit (respiratory secretions):

• Action:

1. Mode of transmission (droplets, hands):

• Action:

1. Portal of entry (your mucous membranes, other patients):

• Action:

1. Susceptible host (roommate, other patients):

• Action:

```

Then compare your ideas with this example solution (don’t peek until you’ve tried):

• Think: Which actions are standard precautions (used for all patients)?
• Which are transmission-based (specific to respiratory infections)?

4. Standard Precautions: Your Everyday Baseline

Standard precautions are the minimum infection prevention practices applied to every patient, every time, regardless of diagnosis or infection status.

Modern guidelines (e.g., CDC, WHO, and many national IPC standards, updated through the COVID-19 era) include:

1. Hand hygiene

• Alcohol-based hand rub (ABHR) if hands are not visibly soiled.
• Soap and water when hands are visibly dirty, after caring for patients with known or suspected C. difficile or norovirus, and after restroom use.

1. Use of PPE based on risk assessment

• Gloves: when contact with blood, body fluids, mucous membranes, non-intact skin, or contaminated surfaces is likely.
• Gown/apron: when clothing may be exposed to blood/body fluids.
• Mask/eye protection/face shield: when splashes or sprays are possible.

1. Respiratory hygiene / cough etiquette

• Encourage covering coughs/sneezes, using tissues, and mask use for symptomatic patients.

1. Safe injection practices

• Single-use needles and syringes, aseptic technique, proper sharps disposal.

1. Safe handling of equipment and environment

• Clean and disinfect reusable equipment between patients.
• Proper linen and waste management.

1. Environmental cleaning and disinfection

• Routine cleaning of high-touch surfaces with approved disinfectants.

Clinical connection:

If you only remember one rule: act as if every patient could have a transmissible infection—because they might, even if not diagnosed yet.

5. Transmission-Based Precautions: Contact, Droplet, Airborne

When standard precautions are not enough, we add transmission-based precautions based on how a pathogen spreads.

1. Contact Precautions

Used for pathogens spread by direct touch or indirect contact via surfaces/equipment.

Examples of conditions:

• MRSA, VRE skin colonization/infection
• C. difficile diarrhea
• Major wound infections

Typical measures (conceptual):

• Single room or cohorting.
• Gloves and gown on room entry.
• Dedicated or disinfected equipment (e.g., stethoscope, BP cuff).

Example:

You’re caring for a patient with C. difficile:

• Perform handwashing with soap and water (ABHR is less effective against spores).
• Wear gloves and gown for any room entry.
• Clean environment with sporicidal disinfectant as per local policy.

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2. Droplet Precautions

Used for pathogens spread by large respiratory droplets (typically travel ~1–2 meters / 3–6 feet).

Examples of conditions:

• Influenza
• Pertussis (whooping cough)
• Meningococcal meningitis

Typical measures:

• Surgical/medical mask for staff/visitors within close distance.
• Patient wears a mask when leaving the room.
• Single room if possible.

Example:

You take vital signs for a patient with suspected influenza:

• Perform hand hygiene.
• Put on a surgical mask before entering.
• Ask the patient to mask when transported to X-ray.

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3. Airborne Precautions

Used for pathogens spread via small airborne particles that remain suspended and travel longer distances.

Examples of conditions:

• Pulmonary tuberculosis (TB)
• Measles
• Varicella (chickenpox)

Typical measures:

• Airborne infection isolation room (AIIR / negative pressure room), if available.
• Fit-tested respirator (e.g., N95, FFP2/FFP3, or equivalent) for staff.
• Patient wears a surgical mask when transported.

Example:

You assist with care for a patient with suspected TB:

• Perform hand hygiene.
• Put on fit-tested respirator before entering.
• Keep the door closed to maintain negative pressure.

Important: Specific PPE types and room requirements can vary by country and institutional policy. Always follow your local, up-to-date guidelines.

6. Hand Hygiene: The Most Important Single Action

Hand hygiene is consistently identified as the most effective IPC measure.

When to Perform Hand Hygiene

A widely used framework (WHO "5 Moments for Hand Hygiene"):

1. Before touching a patient
2. Before clean/aseptic procedures (e.g., IV insertion, catheter care)
3. After body fluid exposure risk
4. After touching a patient
5. After touching patient surroundings

How to Perform Hand Hygiene

Alcohol-based hand rub (ABHR):

• Use when hands are not visibly soiled.
• Apply enough product to cover all hand surfaces.
• Rub all surfaces (palms, backs, between fingers, thumbs, fingertips, wrists) for at least 20–30 seconds, until dry.

Soap and water:

• Use when hands are visibly dirty, after using the toilet, and after caring for patients with C. difficile or norovirus.
• Wet hands, apply soap, rub all surfaces for at least 20 seconds, rinse, dry with a clean towel, and use towel to turn off tap if not hands-free.

Common Pitfalls

• Wearing gloves instead of hand hygiene (you still need hand hygiene before and after glove use).
• Missing the thumbs and fingertips.
• Rushing (less than 20 seconds).

Link to physiology: Remember skin is a barrier organ; damaged or dry skin is more prone to harbor pathogens, so use moisturizer compatible with your facility’s products.

7. PPE Sequencing: Donning and Doffing

Correct order of putting on (donning) and taking off (doffing) PPE reduces self-contamination.

Orders can vary slightly by guideline, but a common, conceptually sound sequence is:

Donning (Putting On PPE)

Try to arrange these steps in the correct order before looking at the answer:

• Gloves
• Gown
• Respirator or mask
• Eye protection (goggles/face shield)

Write your guessed order in your notes.

Now compare to this commonly taught sequence:

```text

1. Gown
2. Mask or respirator
3. Goggles or face shield
4. Gloves

```

Doffing (Removing PPE)

Doffing is higher risk because PPE is contaminated.

Try to arrange these steps in a safe order:

• Gloves
• Gown
• Eye protection
• Mask/respirator

Example of a safe sequence:

```text

1. Gloves (most contaminated)
2. Gown
3. Hand hygiene
4. Goggles or face shield
5. Mask or respirator (after leaving room for airborne, if policy requires)
6. Hand hygiene again

```

Reflect:

• Where would you perform hand hygiene in your sequence?
• How might the sequence change slightly based on local policy or specific PPE design?

Always follow your facility’s current donning/doffing posters and training, which may have been updated after COVID-19 experience.

8. Quick Check: Hand Hygiene and PPE

Answer this question to check your understanding of when to use hand hygiene and PPE.

9. Putting It Together: Two Short Clinical Scenarios

Scenario A: Postoperative Fever

A 72-year-old patient is 2 days post-op after abdominal surgery. Vital signs:

• Temp: 38.5 °C
• HR: 104 bpm
• RR: 22 breaths/min
• BP: 110/70 mmHg

You notice:

• Surgical dressing is slightly moist at the edges.
• Urinary catheter in place.

IPC-focused thinking:

• Chain of infection: possible reservoir at surgical site or catheter.
• Actions:
• Perform hand hygiene before assessment.
• Use clean gloves when inspecting the wound and handling the catheter.
• Maintain aseptic technique for any dressing change.
• Ensure closed drainage system for catheter; no breaks in the line.
• Educate patient about respiratory hygiene and hand hygiene.

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Scenario B: Suspected Pulmonary Tuberculosis

A 40-year-old patient presents with chronic cough, weight loss, night sweats, and hemoptysis. TB is suspected.

IPC-focused thinking:

• Mode of transmission: airborne.
• Actions:
• Place patient in an airborne infection isolation room (if available) or follow local TB isolation policy.
• Perform hand hygiene.
• Wear a fit-tested respirator (e.g., N95/FFP2/FFP3) before entering.
• Keep door closed; limit transport and visitors.
• Educate patient to wear a surgical mask when leaving the room for tests.

In both cases, you apply standard precautions plus appropriate transmission-based precautions based on suspected/known pathogens.

10. Review Key Terms

Flip these cards (mentally or with a partner) to reinforce key IPC concepts.