Which of the following best defines a ‘Blood-Borne Pathogen’?

The definition of a ‘Blood-Borne Pathogen’ is fundamentally linked to the manner in which these pathogens are transmitted. A blood-borne pathogen is specifically defined as a microorganism, such as a virus or bacterium, that is present in an infected person's blood and can be transmitted to others through exposure to that blood. This includes well-known pathogens like the Human Immunodeficiency Virus (HIV) and Hepatitis B and C viruses.

Understanding this definition is crucial, especially in environments such as healthcare, where the risk of exposure to blood is significant. This concept underscores the importance of appropriate safety measures, such as the use of personal protective equipment and stringent hygiene protocols to prevent infection and transmission.

The other choices do not correctly capture the definition of blood-borne pathogens. Option B refers to airborne diseases, which are transmitted through the air and not through blood. Option C involves respiratory infections, which are unrelated to blood transmission. Option D discusses parasites affecting the digestive system, which also does not pertain to blood-borne pathogens. Hence, the first choice accurately encapsulates the correct definition required in this context.