A biosafety level is the level of the biocontainment precautions required to isolate dangerous biological agents in an enclosed facility. The levels of containment range from the lowest biosafety level 1 (BSL-1) to the highest at level 4 (BSL-4). In the United States, the Centers for Disease Control and Prevention (CDC) have specified these levels. In the European Union, the same biosafety levels are defined in a directive.
Read more about Biosafety Level: History, Rationale, List of BSL-4 Facilities
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“The low level which commercial morality has reached in America is deplorable. We have humble God fearing Christian men among us who will stoop to do things for a million dollars that they ought not to be willing to do for less than 2 millions.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)