5.1 Infection Control & Standard Precautions

Why Infection Control Dominates the Exam

Infection control is one of the most heavily tested areas on the New Jersey CNA written exam, and hand hygiene appears in nearly every National Nurse Aide Assessment Program (NNAAP) skill you demonstrate. Long-term care residents are often older, immunocompromised, malnourished, or living in close quarters, so a single lapse by one nurse aide can spark a facility-wide outbreak of influenza, norovirus, or Clostridioides difficile (C. diff). The CNA is the resident's front-line defense, touching residents and surfaces dozens of times a shift.

The Centers for Disease Control and Prevention (CDC) frames prevention around two ideas you must know cold: breaking the chain of infection, and applying Standard Precautions to every person regardless of diagnosis. A healthcare-associated infection (HAI) is an infection a resident acquires while receiving care that they did not have on admission — preventing HAIs is the entire point of the practices below.

The Chain of Infection

An infection can only spread when six links connect in sequence. Break any one link and the infection stops — this is the single most testable concept in the domain.

The weakest link a CNA controls most directly is the mode of transmission — which is exactly why hand hygiene is the headline measure.

Hand Hygiene — The #1 Measure

The CDC names hand hygiene the single most effective way to prevent HAIs. Follow the World Health Organization (WHO) 5 Moments: (1) before touching a resident, (2) before a clean/aseptic task, (3) after body-fluid exposure risk, (4) after touching a resident, and (5) after touching the resident's surroundings.

Use soap and water for at least 20 seconds when hands are visibly soiled, after using the restroom, before handling food, and after caring for a resident with C. diff or norovirus — because alcohol-based hand rub does not kill C. diff spores. Use friction over all surfaces, keep fingertips pointed down so dirty water runs into the sink (not up your arms), rinse, dry with a clean paper towel, and use a new dry paper towel to turn off the faucet so you do not recontaminate clean hands.

Alcohol-based hand rub is acceptable and even preferred for routine decontamination when hands are not visibly soiled, but it never replaces soap and water with spore-forming germs.

PPE Donning and Doffing Order

Personal Protective Equipment (PPE) is worn in a strict CDC sequence so the dirtiest item is removed first and you do not contaminate yourself.

Perform hand hygiene before donning and again after doffing. Gloves go on last and come off first because they become the most contaminated; the mask comes off last during doffing because the front of the mask is dirty and you remove it by the ties or ear loops without touching the face.

Standard vs. Transmission-Based Precautions

Standard Precautions treat all blood, body fluids, secretions, excretions (except sweat), non-intact skin, and mucous membranes as potentially infectious for every resident, all the time — no exceptions, no need to know the diagnosis. Transmission-based precautions are layered on top for known or suspected pathogens.

Residents in isolation still have full rights: explain why the precautions are used, visit and check on them often, and actively prevent loneliness and sensory deprivation.

Biohazard, Sharps, and Asepsis

Dispose of contaminated dressings, gloves, and PPE in a red biohazard bag. Never recap, bend, or hand-pass needles; sharps are placed in a rigid, puncture-proof, leak-proof sharps container that is never overfilled past the fill line. Medical asepsis (clean technique) reduces the number of pathogens and is what a CNA uses for routine care. Surgical asepsis (sterile technique) destroys all microorganisms and is reserved for invasive procedures — outside the CNA scope, although you may set up supplies or assist the nurse.

Handling Linen, Equipment, and the Environment

Everyday medical asepsis is tested constantly through small habits. Hold all linen — clean or soiled — away from your uniform, because your uniform is considered dirty. Carry clean linen to the room only when you will use it; once it enters a room it is not returned to the clean cart. Roll soiled linen with the dirtiest surface inward, never shake it (shaking sends microorganisms into the air), and place it in the laundry bag or hamper, never on the floor or overbed table. The cleanest items go on the cleanest surfaces, and a dropped item is treated as contaminated.

For equipment, use dedicated single-resident items (blood pressure cuff, thermometer) for residents on Contact Precautions, and clean shared equipment with facility disinfectant between residents. Cover coughs into a tissue or your elbow, and follow respiratory-hygiene signage at entrances. These habits break the mode of transmission link without any special equipment.

Common Healthcare-Associated Infections

The exam expects you to recognize the organisms behind facility outbreaks and the precaution each one needs.

Residents most at risk are the susceptible hosts — the very old, the malnourished, those with chronic disease, broken skin, or invasive devices such as a catheter or feeding tube. Strengthening the host (good nutrition, hydration, skin care, and offering the annual influenza vaccine through the nurse) is a quiet but real way the CNA breaks the chain of infection.