Final answer:
Contact Precaution is used when there is a risk of spreading or contracting a microorganism from touching an infected object or person. It involves contact with saliva or respiratory droplets of an infected person. Regular hand washing is vital to prevent the spread of contagious illnesses.
Step-by-step explanation:
Contact Precaution is used when there is a risk of spreading or contracting a microorganism from touching an infected object or person. Contact with saliva or respiratory droplets of an infected person can spread microorganisms. For example, touching a doorknob after someone who has sneezed into their hand can transfer the microbes onto your hands. It is important to wash hands regularly to prevent the spread of contagious illnesses.