Which environmental intervention factor affects risk of infection?

• A. Hand hygiene
• B. Contact with animals
• C. Disinfectant type used
• D. Type of institution

Answer: (C)

Environmental interventions that lower infection risk focus on altering the surroundings to reduce how many pathogens remain on surfaces and in the environment. The disinfectant type used directly changes how effectively those surfaces are decontaminated. Different disinfectants have different antimicrobial spectra (what they kill), required concentrations, contact times, and compatibility with materials. Choosing the right disinfectant for the specific pathogens of concern and applying it correctly—proper precleaning, correct dilution, ensuring the surface stays wet for the required time—significantly reduces environmental contamination and the chance of transmission.

Hand hygiene, while essential, is a behavioral practice that protects the individual wearer/worker rather than modifying the environment itself. Contact with animals relates to exposure risk from a source outside typical environmental cleaning. The type of institution influences policies and resources but is not an environmental intervention by itself.