What are the different levels of biosafety containment and when should they be used ?
Biosafety containment levels are measures taken to isolate hazardous biological agents in labs and research facilities. These range from 1 (low risk) to 4 (high risk), with each level indicating the severity of the risk associated with the agent and the corresponding safety measures required to handle it. Examples include most microorganisms used in teaching labs (BSL-1), human pathogens like Salmonella (BSL-2), Mycobacterium tuberculosis (BSL-3), and Ebola virus (BSL-4). The appropriate biosafety containment level should be determined based on a risk assessment of the biological agent being handled, taking into account factors such as pathogenicity, mode of transmission, availability of effective treatments or vaccines, and potential impact on public health.