A jug of EPA-registered hospital-grade disinfectant lists a tuberculocidal contact time of 10 minutes at the labeled dilution. A nail technician immerses combs and metal nippers for 10 minutes between clients. To be COMPLIANT, she must:
Explanation
Contact time on an EPA label is the MINIMUM time the surface must remain visibly wet with disinfectant at the labeled dilution to achieve the kill claim. Any deviation (shorter time, wrong dilution, partial immersion, soiled solution, uncovered jar that allows evaporation) invalidates the manufacturer's tested efficacy. California licensees must clean implements first (debris physically removed) THEN disinfect, and change the solution at least daily or whenever visibly contaminated, per CCR Title 16 §979 and BBC sanitation practice. Options A, B, and D each break a specific rule and produce a non-compliant cycle that an inspector will cite.
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