Which statement about disinfecting premises and equipment after a BSE diagnosis is correct?

Which statement about disinfecting premises and equipment after a BSE diagnosis is correct?

• A. Any common disinfectant should work
• B. Virkon-S is the disinfectant of choice
• C. There are no disinfectants or physical methods that can reduce the concentration of prions in the environment
• D. Prions are difficult to inactivate, but sodium hypochlorite, sodium hydroxide and autoclaving are among the more effective methods

Answer: (D)

Prions are extremely resistant to inactivation, so cleaning up after BSE requires harsh, validated methods rather than ordinary disinfectants. Among the approaches that have demonstrated relative effectiveness against prions, strong oxidizing or alkaline chemicals and proper high-temperature autoclaving are the most reliable. Sodium hypochlorite (bleach) and sodium hydroxide are capable of denaturing the prion protein, and autoclaving under appropriate high-temperature conditions adds a physical inactivation step. This combination reflects why the statement identifying these methods as among the more effective options is correct. Standard or common disinfectants, including many that are effective for bacteria or viruses, are not reliably effective against prions, which is why options proposing any common disinfectant works or that a single product like Virkon-S is the disinfectant of choice don’t fit. The idea that no disinfectants or physical methods can reduce prions is incorrect, since high-strength chemicals and proper autoclaving have been shown to reduce prion infectivity when applied correctly.

Prions are extremely resistant to inactivation, so cleaning up after BSE requires harsh, validated methods rather than ordinary disinfectants. Among the approaches that have demonstrated relative effectiveness against prions, strong oxidizing or alkaline chemicals and proper high-temperature autoclaving are the most reliable. Sodium hypochlorite (bleach) and sodium hydroxide are capable of denaturing the prion protein, and autoclaving under appropriate high-temperature conditions adds a physical inactivation step. This combination reflects why the statement identifying these methods as among the more effective options is correct.

Standard or common disinfectants, including many that are effective for bacteria or viruses, are not reliably effective against prions, which is why options proposing any common disinfectant works or that a single product like Virkon-S is the disinfectant of choice don’t fit. The idea that no disinfectants or physical methods can reduce prions is incorrect, since high-strength chemicals and proper autoclaving have been shown to reduce prion infectivity when applied correctly.