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|Noun||1.||biosafety level - the level of safety from exposure to infectious agents; depends on work practices and safety equipment and facilities|
tier, grade, level - a relative position or degree of value in a graded group; "lumber of the highest grade"
biosafety level 1 - exposure only to infectious agents that do not ordinarily cause human disease
biosafety level 2 - exposure to infectious agents that can cause disease in humans but whose potential for transmission is limited
biosafety level 3 - exposure to infectious agents that can be transmitted by the respiratory route and which can cause serious infection
biosafety level 4 - exposure to exotic infectious agents that pose a high risk of life-threatening disease and can be transmitted as an aerosol and for which there is no vaccine or therapy