A freshly laundered jacket should be worn daily and changed sooner if contaminated. It should be worn at all times when in restricted or semi-restricted areas in order to contain skin squames that are shed by OR personnel. "The major source of bacteria dispersed into the air comes from health care providers' skin." "Every individual loses a complete layer of skin every four days (about 10,000,000 squames every day). With just the movement of walking, this may cause a loss of 10,000 squames per minute." - quotes from AORN Standards 2011 edition