None of the following are true about N95 masks except
**Core Concept**
N95 masks are a type of respiratory protective device designed to filter out at least 95% of airborne particles, including both large droplets and small aerosols. They are widely used in healthcare settings to prevent the transmission of airborne pathogens.
**Why the Correct Answer is Right**
The correct answer is related to the fact that N95 masks are designed to fit snugly over the nose and mouth, and are intended to be worn for a short duration. They are not designed for extended wear, and are not meant to be used as a substitute for proper hand hygiene or physical distancing. The N95 mask's filter efficiency is maintained by its electrostatic charge, which attracts and traps particles.
**Why Each Wrong Option is Incorrect**
**Option A:** N95 masks are not effective against all airborne pathogens. While they can filter out a wide range of particles, they may not be effective against certain types of viruses or bacteria that are smaller than 0.3 microns.
**Option B:** N95 masks are not reusable. They are designed to be used once and then discarded, as the filter efficiency is compromised after exposure to the environment.
**Option C:** N95 masks are not a substitute for proper hand hygiene. They can help prevent the transmission of airborne pathogens, but they do not prevent the transmission of pathogens through direct contact.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that N95 masks are only effective if they fit properly and are worn consistently. A poorly fitting mask can compromise its filter efficiency and increase the risk of transmission.
**Correct Answer: C. N95 masks are not a substitute for proper hand hygiene.**