Final answer:
Nursing assistants should use friction for 20 seconds during handwashing to effectively remove harmful microorganisms. This duration also aligns with CDC recommendations for preventing the spread of diseases. Humming the "Happy Birthday" song twice can serve as a timer.
Step-by-step explanation:
Nursing assistants should use friction when lathering and washing their hands for at least 20 seconds. This duration is recommended to ensure that all parts of the hands are thoroughly cleaned, including the thumb, wrist, areas between the fingers, and skin under the nails. Using friction helps to create a lather that can assist in removing harmful microorganisms and debris, particularly under the fingernails where germs can easily accumulate.
As suggested by the CDC, handwashing should be a routine practice, particularly after coughing, sneezing, or touching common surfaces, to prevent the spread of illnesses. Properly scrubbing your hands for at least 20 seconds can significantly reduce the risk of contracting and spreading diseases.
One way to help time the process is to hum the "Happy Birthday" song from beginning to end twice. This correlates with the approximate 20-second handwashing guideline.