7.1 Infection Control Overview

7.1 Infection Control Overview

Infection control is the set of practices that keep germs from spreading among residents, staff, and visitors in a long-term care facility. For the Ohio State Tested Nurse Aide (STNA) exam, this is one of the most heavily tested practical topics because frail, elderly residents are highly vulnerable to healthcare-associated infections (HAIs) such as urinary tract infections, pneumonia, Clostridioides difficile (C. diff) colitis, and skin infections.

The chain of infection

Every infection requires six linked elements. If you break any single link, the infection cannot spread. This is the core concept the exam tests.

The link the aide controls most often is the mode of transmission, primarily through hand hygiene and personal protective equipment. The exam frequently gives a scenario and asks which action breaks the chain; the best answer almost always targets transmission. For example, if a resident with an open wound shares a room, dedicating equipment and washing hands between residents attacks transmission, while improving the resident's nutrition addresses the susceptible-host link more slowly.

There are four major modes of transmission to keep straight. Direct contact is skin-to-skin or fluid-to-skin spread, such as touching a draining wound. Indirect contact is spread through a contaminated object, such as a shared blood-pressure cuff, bed rail, or call light. Droplet spread happens when large respiratory droplets travel a short distance, roughly six feet, during coughing, sneezing, or talking. Airborne spread happens when tiny particles stay suspended in the air and travel on air currents, as with tuberculosis or measles.

Knowing which mode an organism uses tells you exactly which protective gear and which type of room are required.

Standard Precautions

Standard Precautions are used for EVERY resident, every time, regardless of diagnosis or known infection status. You treat all blood, body fluids, secretions, excretions (except sweat), non-intact skin, and mucous membranes as if they are infectious. This is the foundation tested repeatedly on the STNA exam — a question that says "a resident with no known infection" is still answered using Standard Precautions.

Key Standard Precaution actions: perform hand hygiene before and after every resident contact, wear gloves when contact with body fluids is likely, wear gowns, masks, and eye protection when splashing is anticipated, handle soiled linen away from your uniform, clean shared equipment between residents, and dispose of sharps and biohazard waste in the proper containers. Respiratory hygiene and cough etiquette are also part of Standard Precautions: cover coughs, offer tissues and masks to coughing residents and visitors, and perform hand hygiene afterward.

A useful way to remember the sweat exception is that sweat is the only body fluid NOT automatically treated as infectious under Standard Precautions. Everything else — blood, urine, stool, saliva, wound drainage, vomit, mucus — is handled as if it carries pathogens, even when the resident appears perfectly healthy. This is why the exam answer never depends on whether the resident "looks sick."

Why this matters for the elderly

Older adults have weaker immune responses, thinner skin, and often carry indwelling devices (urinary catheters, feeding tubes). A small lapse — touching a resident after handling soiled linen without hand hygiene — can transmit an organism that causes sepsis. Common HAIs in long-term care include catheter-associated UTIs, aspiration pneumonia, C. diff, and surgical or pressure wound infections.

Exam logistics anchor

The Ohio STNA exam is administered by D&S Diversified Technologies / Headmaster. The written portion has 79 multiple-choice questions with a 90-minute limit and a 70% passing score. The skills portion requires you to perform 5 of a possible 25 randomly selected tasks, each scored at 80% or higher. Hand hygiene is a "critical" skill embedded in nearly every skills scenario — if you skip or break hand hygiene during a skill, you can fail that station outright.

Common trap to remember now

Do not wait for a diagnosis to use precautions. The wrong mental model is "I only glove up for residents labeled infectious." The exam rewards the aide who applies Standard Precautions universally and adds Transmission-Based Precautions only when an organism requires them.

How infection-control questions are framed

Expect three flavors of question. First, definition recognition — "Standard Precautions mean…" or "The chain of infection includes…". Second, procedure sequencing — "In what order do you put on PPE?" Third, and most common, applied judgment — a short bedside scenario where you choose the safest next action. For applied questions, read for the resident's diagnosis or device, whether body fluids are involved, and what task is being performed; those three cues almost always point to the correct answer.

Keep this overview's vocabulary fresh, because every later section in this chapter builds on the chain of infection and Standard Precautions as its foundation.