Infection Control for the HHA Exam: Complete Study Guide
Master infection control for your HHA certification. Covers standard precautions, PPE, hand hygiene, chain of infection, and everything else tested on the exam.
Infection control is one of the most important — and most heavily tested — topics on the HHA certification exam. This guide covers everything you need to know.
Why Infection Control Matters
Healthcare workers are at the front line of infection spread. HHAs work in intimate settings with vulnerable clients, which makes proper infection control critical. Exam writers know this, which is why infection control questions appear frequently.
Standard Precautions
Standard Precautions treat all blood, body fluids, non-intact skin, and mucous membranes as potentially infectious — regardless of whether the client has a known infection. This applies to every client, every time.
Standard Precautions include:
- Hand hygiene — the single most important measure
- Gloves — for any contact with blood or body fluids
- Masks and eye protection — when splashing is possible
- Gowns — when clothing may become contaminated
- Safe sharps handling — never recap needles by hand
- Proper disposal of contaminated materials
The Chain of Infection
The chain of infection shows how diseases spread. Breaking any link stops transmission.
- Infectious agent — the pathogen (bacteria, virus, fungus)
- Reservoir — where the pathogen lives (person, animal, environment)
- Portal of exit — how it leaves the reservoir (coughing, wound drainage)
- Mode of transmission — how it travels (direct contact, droplets, air)
- Portal of entry — how it enters a new host (mouth, broken skin, respiratory tract)
- Susceptible host — a person who can get infected
HHAs break the chain primarily through hand hygiene and PPE.
Hand Hygiene: The #1 Exam Topic
Handwashing with soap and water is required when:
- Hands are visibly soiled
- Before eating
- After using the bathroom
- After caring for a client with C. diff (alcohol does NOT kill C. diff spores)
Alcohol-based hand sanitizer (≥60% alcohol) is acceptable when hands are not visibly soiled. Use it before and after client contact, after removing gloves, and before putting on gloves.
The 5 Moments for Hand Hygiene (WHO):
- Before patient contact
- Before an aseptic task
- After body fluid exposure
- After patient contact
- After contact with patient surroundings
Transmission-Based Precautions
Some infections require additional precautions beyond Standard:
| Type | Diseases | Extra PPE |
|---|
|------|----------|-----------|
| **Contact** | MRSA, C. diff, scabies | Gloves + gown |
|---|---|---|
| Droplet | Flu, COVID, pertussis | Mask |
| Airborne | TB, measles, chickenpox | N95 respirator |
PPE: Donning and Doffing
Donning order: Gown → Mask/respirator → Goggles → Gloves
Doffing order (most contaminated first): Gloves → Goggles → Gown → Mask
Remove PPE at the doorway before leaving the client's room.
Common Exam Questions
- What should an HHA do first before providing personal care? Wash hands.
- When should gloves be changed? Between tasks on the same client, and always between clients.
- What kills C. diff spores? Soap and water — not alcohol sanitizer.
- A client has TB. What precaution level is required? Airborne (N95 respirator).
Key Takeaways
- Standard Precautions apply to every client.
- Hand hygiene is the #1 infection prevention measure.
- Know the difference between contact, droplet, and airborne precautions.
- Breaking the chain of infection is the HHA's primary defense.
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