In the cleanroom industry the term biosafety refers to the minimisation of any potential risk that may occur from using biotechnology.
Biosafety can refer to safety precautions taken against potential harmful exposure to tissue, organ, virus, gene therapy products in a medical setting.
In chemical industry the protection may be against such agents as nitrates, PCB levels.
In the agricultural or food industry the protection may be against bacteria, viral genes or prions.
The Biosafety levels are measured in a 1,2,3,4 protocol, 4 being the most dangerous.