Final answer:
It is necessary to wear gowns or other protective body coverings when handling contaminated materials, working with infected patients, and entering infection zones as they help prevent the spread of pathogens and reduce the risk of infection.
Step-by-step explanation:
It is necessary to wear gowns or other protective body coverings when handling contaminated laundry, when working with contaminated specimens or equipment, and when entering infection zones. These protective measures help prevent the spread of pathogens and reduce the risk of infection to the wearer. Wearing gloves, goggles, aprons, and face protection when instructed to do so is also important for personal safety in various settings.