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TL;DR

Chain of Infection: Six links required for disease transmission: infectious agent, reservoir, portal of exit, transmission mode, portal of entry, susceptible host.

By Valenke Exam Prep Team·Last updated 2026-06-02

Chain of Infection

CNA NNAAPCST SURGICAL TECHMEDICAL ASSISTANT

Definition

Six links required for disease transmission: infectious agent, reservoir, portal of exit, transmission mode, portal of entry, susceptible host.

Common Errors

Common nursing assistant errors with chain of infection:

Documentation

CNAs document chain of infection findings by reporting to the nurse and recording in the medical record. Key observations to document:

Exam Focus Areas

On the Cna Nnaap, Cst Surgical Tech, Medical Assistant exam(s), questions about chain of infection typically test:

  1. Proper procedure for activities of daily living (ADLs)
  2. Resident rights and appropriate responses to violations
  3. Observations that must be reported to the nurse immediately
  4. Body mechanics and safe transfer techniques

Safety Considerations

Safe practice of chain of infection requires proper body mechanics and fall prevention:

Workplace Applications

Applying chain of infection in daily practice as a nursing assistant:

Why It Matters

Chain of infection and breaking each link tested on CNA, CST, and MA exams.

Related Terms

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Frequently Asked Questions

What resident rights relate to chain of infection?
For chain of infection: Right to privacy for personal care, mail, phone conversations, medical information. Right to participate in care planning and be informed about condition and treatment changes. Right to be treated with dignity and respect at all times.
How should a CNA communicate about chain of infection?
For chain of infection: Avoid false reassurance (do not say everything will be fine), acknowledge feelings instead. Cultural sensitivity: respect food preferences, spiritual practices, family dynamics. Report behavioral changes to the nurse: withdrawal, aggression, crying, confusion.
How does a CNA assist with chain of infection?
For chain of infection: Oral care: Position at 45 degrees or side-lying if unconscious; Apply lip moisturizer; Brush teeth/dentures with soft brush. Safety: Unconscious: position to side, suction available.