Final answer:
A step of proper hand washing is removing dirt underneath fingernails. This is part of the CDC's handwashing recommendations which also advise lathering, rinsing, and drying hands thoroughly to prevent the spread of pathogens.
Step-by-step explanation:
One step of proper hand washing is removing dirt underneath fingernails. This is crucial because nails can harbor dirt and microorganisms that may lead to infections. The Centers for Disease Control and Prevention (CDC) outlines a handwashing procedure that includes several steps to ensure hands are properly cleaned.
These recommend using soap and warm running water, lathering the backs of your hands, between your fingers, and under your nails, and scrubbing for at least 20 seconds. It is also important to rinse the hands well and dry them thoroughly with a clean towel or air dryer, using the towel to turn off the faucet and open doors to avoid recontamination.