Infection Control, Sanitation, and Safety
This domain tests whether you can break the chain of infection in a real service, not just recite vocabulary. Expect questions on cleaning versus disinfection, contact time, hand hygiene, personal protective equipment, and handling of blood or sharps.
The chain and where you break it
Infection needs a pathogen, a reservoir, a portal of exit, a mode of transmission, a portal of entry, and a susceptible host. Esthetic practice intervenes at transmission: clean hands, clean implements, barriers, and covered waste.
Three levels of control
- Cleaning removes soil and organic matter with soap and water. It must come first; disinfectant cannot penetrate debris.
- Disinfection destroys most pathogenic organisms on nonporous surfaces using an EPA-registered hospital-grade product at the label's contact time.
- Sterilization destroys all microbial life including spores; it is required for items that penetrate skin and is not the esthetician's routine standard.
Practical rules
Wash hands before and after every client and after glove removal. Wear gloves for waxing, extractions, and any blood contact. Never double-dip a spatula or applicator. Porous items - cotton, wooden sticks, paper, linens - are single-use or laundered. Discard sharps immediately into a rigid sharps container.
Worked example
A tweezer falls on the floor mid-service. Reasoning: it is contaminated with soil, so a quick alcohol wipe is inadequate - alcohol is not a hospital-grade disinfectant and debris shields organisms. The correct sequence is clean with soap and water, dry, then immerse in an EPA-registered disinfectant for the full label contact time before reuse.
Traps
Skipping cleaning before disinfection; shortening contact time; treating 70% alcohol as a bloodborne-pathogen disinfectant; reusing a "disinfected" porous item; touching a clean tool with gloves that just touched the client.