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Infection Control · single question

A dentist can prevent the spread of contagious disease MOST effectively by:

  1. Wearing gloves during all clinical procedures
  2. Hand hygiene (handwashing/alcohol-based hand rub)
  3. Wearing an N95 mask for all patients
  4. Using double gloving
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Correct answer: B. Hand hygiene (handwashing/alcohol-based hand rub)

  • A. Gloves are essential PPE but do not replace hand hygiene — organisms can still contaminate hands during glove removal.
  • B. Correct. Hand hygiene is the single most effective measure for preventing transmission of contagious diseases in healthcare settings, according to the CDC and WHO. It must be performed before and after patient contact, after removing gloves, and before and after procedures.
  • C. N95 masks are required for airborne precautions (TB, measles, varicella) but are not standard for all patients.
  • D. Double gloving provides additional protection in high-risk situations but is not the single most impactful preventive measure.

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