Pathogens are disease-carrying bacteria or viruses.
Bloodborne pathogens are bacteria or viruses which exist in blood or other body fluids or secretions. Obviously, those working in fields like health care and public safety are most likely to come into contact with blood or body fluids. However, injuries can happen anywhere and there is always the possibility of coming into contact with blood. Rather than turn our backs, we use universal precautions. Always use gloves.