Infection Control, Sanitation, Disinfection and Safety
Infection Control
Why this domain matters
Infection control questions test whether you can trace how a pathogen moves from one person to another and where your practice interrupts that path. Learn the six links of the chain of infection: infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, and susceptible host. A single broken link stops transmission, which is why hand hygiene, barriers, and correct disinfection all matter.
Know your pathogens
Bacteria include staphylococci, streptococci, Pseudomonas, and Mycobacterium fortuitum, the last a frequent colonizer of poorly maintained footbaths. Viruses include hepatitis B and C, HIV, herpes simplex, and HPV. Fungi such as Trichophyton cause tinea pedis and onychomycosis. Hepatitis B is the most infectious and environmentally stable bloodborne virus; HIV is the least stable. Infestations such as scabies and lice are also transmissible through shared linens.
Traps candidates fall for
- Believing a hospital disinfectant sterilizes; it does not reliably kill bacterial spores.
- Believing gloves replace handwashing; gloves are a barrier, not a substitute.
- Thinking a nail technician may diagnose an infection. You identify signs and refer.
- Forgetting that an exposure incident requires washing, reporting, and medical follow-up, not just wiping the area.
Rule of thumb
If an item cannot be cleaned and disinfected, treat it as single-use and discard it or give it to the client. That single habit prevents most cross-contamination errors on the exam and in the salon.
Sanitation, Disinfection and Safety
The three levels
Sanitation (cleaning) scrubs away visible debris and reduces microbial load. Disinfection destroys most microorganisms on hard, nonporous surfaces using an EPA-registered hospital-grade disinfectant. Sterilization destroys all microbial life, including spores, and is required for implements that break the skin. Implements are often classified as critical (break skin), semicritical (contact nonintact skin or mucous membranes), and noncritical (contact intact skin only).
The two-step habit
Never skip cleaning. Organic matter inactivates disinfectants, so wash with soap and water, rinse, dry, then fully immerse in the correct dilution for the full label contact time. Use a labeled, lidded container, change solution per the manufacturer (often daily or when visibly soiled), and date it. Remove implements with clean hands or tongs, rinse, dry, and store in a covered clean container.
Footbaths and tools
Footbaths demand scrubbing of walls and impeller area, flushing of the system with detergent, then application of an EPA-registered disinfectant for the labeled contact time before drying. Buffers, wooden sticks, cotton, and porous files cannot be disinfected reliably; discard or give them away. Drill bits and bits with crevices must be cleaned and disinfected per manufacturer instructions.
Safety basics
Keep chemicals in labeled original containers, read the SDS, ventilate, and never eat or drink at the station. Keep cords away from water, use GFCI outlets, unplug before cleaning, and never carry a plugged-in tool by its cord. Store chemicals below eye level.
Traps
Questions love the phrases "soak only," "UV lamp sterilizes," and "any bleach dilution works." All are wrong. Contact time comes from the product label, not from habit.