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The term BSI refers to Body Substance Isolation, which is a set of precautions used in medical settings to prevent the transmission of infectious diseases. The concept emphasizes the importance of treating all bodily fluids as potentially infectious, thereby enhancing safety for healthcare providers and patients alike.

Implementing Body Substance Isolation involves wearing appropriate personal protective equipment (PPE), such as gloves, masks, and gowns, depending on the exposure risk. This practice was developed to reduce the likelihood of exposure to pathogens found in a variety of bodily fluids—including blood, saliva, urine, and other secretions—thereby promoting a safe and sanitary environment.

While the other options suggest various safety and infection control measures, they do not correspond to the widely recognized term used in the context of personal protective measures within healthcare environments. Each of those alternatives could represent valid concepts in different contexts, but they do not capture the specific precautions referred to by BSI.