24 Infection Control & Safety Practice Questions & Answers

1. 1. Before a metal cuticle nipper is placed in disinfectant solution, it must first be washed with soap and water and scrubbed with a brush. What is the reason for this required first step?

   • A.Soap and water destroy the bacterial spores that would otherwise survive disinfection
   • B.Visible debris, oil and skin cells shield microorganisms from the disinfectant, so the product cannot perform as it was tested and registered✓ Answer
   • C.Washing activates the virucidal claim printed on the disinfectant label
   • D.Cleaning may be substituted for disinfection whenever the implement did not touch broken skin

   Cleaning is the mandatory first level of decontamination because organic soil physically blocks the disinfectant from reaching microorganisms and can chemically inactivate the active ingredient. EPA-registered disinfectants are tested on pre-cleaned hard, nonporous surfaces, so their kill claims are only valid after washing, rinsing and drying.

   Source: Milady Standard Nail Technology 8e, Infection Control chapter (levels of decontamination); EPA-registered disinfectant label directions requiring pre-cleaningReport a problem with this question

2. 2. Which method is the only one that destroys ALL microbial life, including bacterial spores?

   • A.Cleaning the item with detergent, water and a scrub brush
   • B.Sanitizing the item with an alcohol-based hand product
   • C.Sterilizing the item in an autoclave (steam under pressure) with biological spore-strip monitoring✓ Answer
   • D.Immersing the item in an EPA-registered hospital disinfectant for 10 minutes

   Sterilization is the highest level of decontamination and is the only one that kills spores, because spores are a dormant, heat- and chemical-resistant survival form that liquid disinfectants cannot reliably destroy. Sterilization requires an autoclave or dry-heat sterilizer plus biological (spore) monitoring to prove the cycle worked; disinfection kills most pathogens but never spores.

   Source: Milady Standard Nail Technology 8e — four levels of decontamination (cleaning, sanitizing, disinfecting, sterilizing); CDC sterilization definitionReport a problem with this question

3. 3. A technician finishes a manicure. Which of the following items MUST be thrown away after this single client rather than cleaned and disinfected for reuse?

   • A.The metal tweezers
   • B.The glass nail file
   • C.The stainless-steel cuticle nipper
   • D.The wooden (orangewood) pusher stick✓ Answer

   Disinfectants are registered only for hard, NONPOROUS surfaces, so any porous item — wood, cardboard, foam, cotton, sanding bands, non-sealed buffers and files, toe separators, pumice — absorbs contaminated moisture and can never be disinfected; it is single-use and must be discarded after one client. Stainless steel, glass and metal are nonporous and may be cleaned, immersed and reused.

   Source: Milady Standard Nail Technology 8e — single-use vs. multiuse implements; EPA disinfectant labels limited to hard nonporous surfacesReport a problem with this question

4. 4. What is the correct role of an ultraviolet (UV) "sanitizer" box in a nail salon?

   • A.It is a clean, dry storage container for implements that have already been cleaned and disinfected✓ Answer
   • B.It is an EPA-registered sterilizer that replaces liquid immersion disinfection
   • C.It substitutes for washing implements with soap and water
   • D.It disinfects porous items such as files, buffers and wooden sticks

   A UV box is a storage cabinet, not a disinfection device: UV light only reaches surfaces directly exposed to the lamp, cannot penetrate soil or the shadowed sides and hinges of implements, and UV boxes carry no EPA registration for salon implement disinfection. Implements must be cleaned and immersed in an EPA-registered disinfectant first, then stored dry in a covered, disinfected container — which is all the box provides.

   Source: Milady Standard Nail Technology 8e — UV/ultraviolet units are storage containers, not disinfectants; EPA registration requirement for disinfection claimsReport a problem with this question

5. 5. Which statement correctly distinguishes an antiseptic from a disinfectant?

   • A.Antiseptics are EPA-registered for surfaces, while disinfectants are FDA-regulated for use on skin
   • B.Both are EPA-registered and may be used interchangeably on skin and on surfaces
   • C.A disinfectant diluted to half the label strength becomes an antiseptic that is safe on skin
   • D.Antiseptics are FDA-regulated and applied to skin, while disinfectants are EPA-registered and used only on hard, nonporous surfaces✓ Answer

   Antiseptics are drugs regulated by the FDA and are formulated to reduce microorganisms on living skin, while disinfectants are pesticides registered by the EPA and are formulated for inanimate hard, nonporous surfaces. Disinfectants are far too caustic for skin and can cause chemical burns and sensitization, so the two categories are never interchanged and diluting a disinfectant does not make it skin-safe.

   Source: Milady Standard Nail Technology 8e — antiseptics vs. disinfectants; FDA OTC antiseptic drug regulation vs. EPA FIFRA disinfectant registrationReport a problem with this question

6. 6. A nail technician is selecting an immersion disinfectant for multiuse implements. What must appear on the product label?

   • A.An EPA registration number together with bactericidal, virucidal and fungicidal efficacy claims✓ Answer
   • B.A "sanitizer" claim plus a fragrance-free statement
   • C.The marketing phrase "hospital grade," which alone is sufficient proof of efficacy
   • D.An FDA Drug Facts panel listing the active ingredients

   Salon implement disinfectants must be EPA-registered, and the registration number plus the efficacy claims are the proof that the product was tested to kill the organisms of concern — bacteria, viruses and fungi. "Hospital disinfectant" is an EPA efficacy classification meaning the product was proven effective against Pseudomonas aeruginosa and Staphylococcus aureus, not a marketing grade or a strength the technician mixes; many states additionally require a tuberculocidal claim.

   Source: EPA antimicrobial product registration (FIFRA) — hospital disinfectant classification (P. aeruginosa + S. aureus); Milady Standard Nail Technology 8e disinfectant selectionReport a problem with this question

7. 7. A technician mixes a concentrated disinfectant at double the dilution stated on the label, reasoning that a stronger solution is safer. How should this be evaluated?

   • A.Acceptable, because a stronger solution kills pathogens faster
   • B.Improper — it is misuse of the product and a violation of the label, which is the legally binding directions for use✓ Answer
   • C.Acceptable, because it shortens the required contact time proportionally
   • D.Required whenever the implements look especially dirty

   For an EPA-registered product the label is the law: the dilution and contact time on the label are the exact conditions under which the kill claims were proven, so any deviation is misuse. An over-concentrated solution does not disinfect faster; it corrodes implements, damages skin and lungs, and wastes product, while an under-concentrated solution fails to disinfect at all.

   Source: FIFRA §12(a)(2)(G) — use inconsistent with the labeling is prohibited; EPA disinfectant label dilution and contact-time directionsReport a problem with this question

8. 8. How should a hinged metal nipper be placed into a quaternary ammonium (quat) disinfectant solution?

   • A.Opened at the hinge and completely submerged for the full contact time stated on the label✓ Answer
   • B.Laid on the surface of the solution with the container covered
   • C.Dipped briefly and then wiped with a 70% alcohol pad
   • D.Submerged only to the cutting jaws, since that is the part that touches the client

   A disinfectant only works where it makes wet contact, so every surface — including hinges, grooves and handles that were touched by contaminated hands — must be fully immersed for the entire label contact time (commonly about 10 minutes for quats). Partial immersion, a quick dip, or an alcohol wipe leaves untreated surfaces and does not meet the tested conditions of the registration.

   Source: Milady Standard Nail Technology 8e — complete immersion procedure for multiuse implements; EPA disinfectant label contact-time directionsReport a problem with this question

9. 9. Two days after mixing, the implement disinfectant solution is cloudy and contains visible debris, although the label says the solution may be used for one week. What should the technician do?

   • A.Strain out the debris and keep using the same solution
   • B.Discard the solution now, clean and disinfect the container, and mix a fresh solution✓ Answer
   • C.Add more concentrate to strengthen the weakened solution
   • D.Continue using it until the label's one-week interval has elapsed

   The interval printed on the label is a maximum, not a guarantee: organic matter neutralizes the active ingredient, so a cloudy or visibly contaminated solution must be replaced immediately regardless of the date. Implements are also removed from the solution with tongs, a basket or gloved hands, air-dried, and stored in a clean, covered, disinfected container — never left soaking in used disinfectant.

   Source: Milady Standard Nail Technology 8e — changing disinfectant solution when contaminated or per label interval; storage of disinfected implementsReport a problem with this question

10. 10. What must be done to a pedicure foot spa after EVERY client?

    • A.Nothing beyond end-of-day cleaning, because the water is changed for each client
    • B.Drain the tub and wipe the basin with a 70% alcohol wipe
    • C.Refill with hot water and run the jets for five minutes
    • D.Drain the tub, remove and clean the inlet screen/filter and basin with soap and a brush, rinse, then refill and circulate an EPA-registered disinfectant for the full label contact time before draining and rinsing✓ Answer

    Foot spas must be cleaned and then disinfected after every client, and the disinfectant must be CIRCULATED through the system because contaminated water and skin debris are pulled behind the inlet screen and into the piping where wiping cannot reach. Simply draining or wiping the visible basin leaves the internal surfaces — the actual reservoir of infection — untreated.

    Source: Milady Standard Nail Technology 8e — pedicure bath cleaning and disinfection after each client; OSHA nail salon guidance on foot spa disinfection per manufacturer contact timeReport a problem with this question

11. 11. Documented outbreaks of painful boils and skin infections on clients' legs after pedicures were traced to Mycobacterium fortuitum in salon foot spas. What condition allowed these bacteria to survive?

    • A.The water was heated above a safe temperature and scalded the skin
    • B.The disinfectant was mixed stronger than the label and burned the skin
    • C.Clients shared the same pair of pedicure slippers
    • D.Bacteria grew in a biofilm behind the recirculation inlet screen and inside the piping, where surface wiping never reached, and entered through skin nicked by shaving or callus removal✓ Answer

    Biofilm is a protective layer of microorganisms and debris that forms on wet internal surfaces and resists ordinary cleaning, which is why investigators recovered mycobacteria from behind the inlet screens of nearly every foot spa sampled. Infection required a portal of entry, so clients who had shaved their legs or had skin abraded during the service were the ones who developed furunculosis — the reason screens must be removed and scrubbed and disinfectant circulated through the lines.

    Source: CDC/CA Department of Health Services investigations of nail salon Mycobacterium fortuitum furunculosis outbreaks; Milady Standard Nail Technology 8e biofilmReport a problem with this question

12. 12. A salon uses pipe-free (pipeless) pedicure tubs with disposable plastic liners. Which statement is correct?

    • A.Pipe-free tubs require only end-of-day cleaning because they have no plumbing
    • B.The liner is discarded after one client, the basin and any removable parts are still cleaned and disinfected, and the service is entered in the dated cleaning log✓ Answer
    • C.A liner may be rinsed and reused if the same client returns later in the week
    • D.Using a liner eliminates the need to clean and disinfect the basin

    Liners and pipe-free designs reduce but do not eliminate contamination: water splashes over and under liners, and jets, impellers and removable parts still contact skin debris, so cleaning and disinfection after every client remain mandatory. A liner is porous single-use plastic that can never be disinfected, and boards require a dated cleaning log so inspectors can verify that each client's disinfection actually occurred.

    Source: Milady Standard Nail Technology 8e — pedicure equipment (pipeless and liner systems); state board foot spa cleaning-log requirements (specific intervals vary by state)Report a problem with this question

13. 13. While filing a client's nail, the technician accidentally nicks the side of the finger and it begins to bleed. What is the FIRST action?

    • A.Apply antiseptic to the cut and continue the service
    • B.Finish the nail quickly so the client is not inconvenienced, then clean up
    • C.Stop the service immediately and put on gloves✓ Answer
    • D.Wipe the blood away with a bare hand and reach for a bandage

    Under Standard (Universal) Precautions all blood is treated as infectious, so the technician must stop and establish a barrier before touching anything: stop the service, glove up, have the client apply pressure with a clean gauze or cotton pad, apply antiseptic and a bandage, bag the contaminated materials, clean and disinfect the station and implements, then remove gloves and wash hands. Touching blood bare-handed or continuing to work over an open wound exposes both parties to bloodborne pathogens.

    Source: OSHA Bloodborne Pathogens Standard 29 CFR 1910.1030 (universal precautions, PPE); Milady Standard Nail Technology 8e blood exposure procedureReport a problem with this question

14. 14. A metal implement has been contaminated with a client's blood. How must it be handled before it can be used again?

    • A.Clean it, then fully immerse it for the full contact time in a disinfectant whose label carries an HIV-1 and HBV claim, or a tuberculocidal claim✓ Answer
    • B.Wipe it with 70% alcohol and return it to the drawer
    • C.Throw it in the regular trash, because contaminated metal cannot be salvaged
    • D.Rinse it under hot running water and place it in the UV storage box

    Blood-contaminated nonporous implements are cleaned and then disinfected with a product specifically proven against bloodborne viruses, because hepatitis B virus is far more durable on environmental surfaces than HIV and survives ordinary wiping. An alcohol wipe, a rinse or a UV box provides no registered kill claim for HBV, so those steps do not make the implement safe to reuse.

    Source: OSHA 29 CFR 1910.1030 (decontamination of contaminated equipment); EPA disinfectant efficacy claims for HIV-1/HBV and tuberculocidal productsReport a problem with this question

15. 15. Where a salon employer determines that employees have occupational exposure to blood, what does the OSHA Bloodborne Pathogens Standard require the EMPLOYER to do?

    • A.Require employees to purchase their own gloves and eye protection
    • B.Have every client tested for bloodborne pathogens before service
    • C.Maintain a written Exposure Control Plan, provide training and PPE at no cost, and offer the hepatitis B vaccination series free of charge to exposed employees✓ Answer
    • D.Keep the exposure control plan at a corporate office and provide it only if an inspector requests it

    The standard places the duty and the cost on the employer: a written, accessible Exposure Control Plan, annual training, free PPE, and the hepatitis B vaccine offered at no cost within 10 working days of assignment. Client testing is never a control measure, because Standard Precautions assume every person's blood may be infectious.

    Source: OSHA Bloodborne Pathogens Standard 29 CFR 1910.1030(c), (f), (g) — exposure control plan, HBV vaccination at no cost, training and PPEReport a problem with this question

16. 16. Which statement about HIV, hepatitis B (HBV) and hepatitis C (HCV) in the nail salon is accurate?

    • A.All three are readily spread by casual contact such as shaking hands or sharing a chair
    • B.Hepatitis B cannot be transmitted by an implement contaminated with a previous client's blood
    • C.All three are bloodborne, so Standard Precautions require treating every client's blood and body fluids as if they were infectious✓ Answer
    • D.HIV survives longer on environmental surfaces than HBV, which is why implements must be disinfected

    HIV, HBV and HCV are transmitted through blood and certain body fluids — not through casual contact, tools that never contacted blood, or shared air — so the salon control is preventing blood contact and properly disinfecting anything blood touches. Standard Precautions exist because a technician cannot know who is infected, and HBV is the most durable of the three on surfaces, which sets the disinfection standard.

    Source: CDC bloodborne pathogen transmission guidance; OSHA 29 CFR 1910.1030 universal precautions; Milady Standard Nail Technology 8eReport a problem with this question

17. 17. A client returns with a pale green to dark discoloration on the nail plate under an enhancement. What is this condition?

    • A.A bacterial infection, most often caused by Pseudomonas aeruginosa✓ Answer
    • B.A mold growing between the nail plate and the enhancement
    • C.A fungal infection (onychomycosis) that the technician should treat with an antifungal
    • D.A bruise (hematoma) caused by trauma to the nail bed

    The green discoloration commonly called a "greenie" is a BACTERIAL infection, not a mold or fungus: Pseudomonas aeruginosa thrives in the warm, moist gap created when an enhancement lifts, and the color comes from bacterial pigment staining the plate. The correct response is to remove the enhancement, refuse further enhancement service, and refer the client to a physician, because a nail technician may not diagnose or treat any infection.

    Source: Milady Standard Nail Technology 8e — nail disorders and diseases (Pseudomonas bacterial infection under enhancements); scope-of-practice rule prohibiting diagnosis or treatmentReport a problem with this question

18. 18. A client arrives with a red, swollen, pus-filled area around the nail fold. What is the correct action?

    • A.Disinfect the area with the implement disinfectant and proceed carefully with the manicure
    • B.Drain the pus with a freshly disinfected implement and then perform the service
    • C.Decline or postpone the service and refer the client to a physician✓ Answer
    • D.Apply an over-the-counter antibiotic ointment and rebook the client for next week

    Visible infection, inflammation, an open lesion or a contagious condition is a contraindication: servicing it can spread the pathogen to the technician, the implements and later clients, and can worsen the client's condition. A nail technician's licence permits cosmetic services only — never diagnosing, treating, draining, prescribing, or applying a disinfectant to living skin — so the client must be referred to a physician.

    Source: Milady Standard Nail Technology 8e — contraindications and scope of practice (refer clients with infection or inflammation to a physician)Report a problem with this question

19. 19. What is the correct hand-hygiene requirement for a nail technician?

    • A.Hand sanitizer alone is sufficient even when the hands are visibly soiled
    • B.Wash hands with soap and warm running water before and after every client and after removing gloves✓ Answer
    • C.Gloves may be washed and reused between clients as long as they are not torn
    • D.Washing once at the start of the day is enough as long as gloves are worn

    Handwashing with soap, warm running water and friction physically removes pathogens and organic soil that hand sanitizer cannot penetrate, which is why sanitizer is not a substitute for visibly soiled hands. Gloves are single-use PPE that develop micro-tears and contaminate the hands during removal, so they are discarded and hands are washed immediately afterward.

    Source: Milady Standard Nail Technology 8e — hand washing before and after each client; OSHA 29 CFR 1910.1030(d)(2)(v)-(vi) handwashing and single-use glovesReport a problem with this question

20. 20. Under OSHA's Hazard Communication Standard, which statement about Safety Data Sheets (SDS, formerly called MSDS) is correct?

    • A.They contain 8 sections and are optional for products used in cosmetology
    • B.They may be kept in a locked office because they disclose proprietary formulas
    • C.They only need to be requested from the manufacturer after an accident has occurred
    • D.The employer must obtain them and keep them readily accessible to employees in the workplace, and they follow a standardized 16-section format✓ Answer

    The manufacturer or distributor must supply an SDS for every hazardous product, and the employer must obtain it, keep it accessible during every work shift without barriers such as a locked office, and train employees on the hazards. Since GHS alignment the MSDS became the SDS with 16 standardized sections in a fixed order, so first aid (Section 4), fire-fighting (Section 5), handling and storage (Section 7) and PPE (Section 8) can be located instantly in an emergency.

    Source: OSHA Hazard Communication Standard 29 CFR 1910.1200(g) — SDS availability and Appendix D 16-section formatReport a problem with this question

21. 21. Which control is the most effective way to remove monomer vapors and filing dust from a nail technician's breathing zone?

    • A.A disposable paper dust mask worn during services
    • B.A ceiling fan positioned above the manicure table
    • C.A tabletop air purifier that filters and recirculates the air back into the room
    • D.Local exhaust ventilation at the table that captures contaminants at the source and vents them to the outside✓ Answer

    The hierarchy of controls ranks source capture and engineering controls above PPE, and only exhaust that discharges outdoors actually removes the contaminant from the salon. Recirculating purifiers and ceiling fans merely move contaminated air around, and a paper dust mask or N95 filters particles only — it does nothing against chemical vapors, which require a properly fitted respirator with organic-vapor cartridges.

    Source: NIOSH/OSHA hierarchy of controls and OSHA nail salon ventilation guidance (local exhaust vented outdoors); Milady Standard Nail Technology 8e ventilationReport a problem with this question

22. 22. Which practice meets safe chemical handling and storage requirements in a nail salon?

    • A.Keeping a covered drink at the workstation so the technician stays hydrated during long services
    • B.Pouring leftover monomer from the dappen dish back into the original bottle at the end of the day
    • C.Keeping flammables capped in their labeled original containers away from heat and flame, labeling any secondary container, and placing product-soaked cotton in a covered metal waste container✓ Answer
    • D.Storing acetone in an unlabeled squeeze bottle kept next to the curing lamp for convenience

    OSHA HazCom requires products to stay in labeled containers — including any secondary container the technician fills — so that hazards, first-aid and fire information are identifiable at a glance, and flammables such as acetone, alcohol, monomer and adhesives must be kept capped and away from heat, flame and sunlight. Solvent-soaked cotton is a fire hazard and belongs in a covered metal can; used product is never returned to the bottle and no eating or drinking is allowed at the workstation because products can contaminate food.

    Source: OSHA Hazard Communication Standard 29 CFR 1910.1200(f) container labeling; Milady Standard Nail Technology 8e safe storage of flammable products and salon fire safetyReport a problem with this question

23. 23. A technician who has used gel products for years develops itching, redness and small blisters on her fingertips and eyelids. What is the most likely explanation?

    • A.It is a bacterial infection that should be treated by applying implement disinfectant to the skin
    • B.Repeated skin contact with uncured product caused an allergic sensitization, which is cumulative — once allergic, the reaction returns with any further exposure✓ Answer
    • C.The batch of product was defective or contaminated and a new bottle will solve the problem
    • D.It is simple overexposure to vapors and will resolve as soon as a window is opened

    Allergic contact dermatitis from methacrylates and HEMA is a delayed, cumulative sensitization: the body reacts only after repeated exposures, so years of safe use do not prove future safety, and once sensitized the person reacts to even tiny amounts for life. The prevention rule is that uncured product must never touch skin — the reaction comes from skin contact and over-filing, not from properly cured product on the nail plate — and the affected person should see a physician.

    Source: Milady Standard Nail Technology 8e — overexposure principle and allergic sensitization to uncured monomers/gels (methacrylates, HEMA)Report a problem with this question

24. 24. Which statement best reflects how most state boards treat methyl methacrylate (MMA) monomer and credo (razor-type) callus shavers?

    • A.Credo blades are permitted if disinfected between clients, and MMA is banned nationwide by federal statute
    • B.Both are permitted as long as the technician has completed advanced training
    • C.MMA is acceptable when ventilation is adequate, while credo blades are prohibited
    • D.Most state boards prohibit both — MMA because it bonds too aggressively and causes nail plate damage and allergic reaction, and credo blades because they cut living skin, which is outside a nail technician's scope of practice✓ Answer

    MMA forms an extremely hard, rigid product that bonds more strongly than the natural nail, so trauma tears the plate from the bed rather than breaking the enhancement, and it is a known sensitizer; regulators acted against 100% MMA nail products and a large majority of states prohibit its salon use, though the exact rule varies by state. Credo/razor-type shavers cut living skin, which no nail technician licence permits, and the resulting wound is a direct portal of entry for the bacteria and mycobacteria found in pedicure equipment.

    Source: Milady Standard Nail Technology 8e — MMA and prohibited implements; FDA action against 100% MMA nail products; state board scope-of-practice rules prohibiting cutting living skin (specific rules vary by state)Report a problem with this question

Practice questions based on the NIC national nail technology content outline. Not affiliated with NIC, PSI, or any state board. Your state may add state-law content — check your board's requirements. About NIC exams →