| biosafety | (n) safety from exposure to infectious agents |
| biosafety level | (n) the level of safety from exposure to infectious agents; depends on work practices and safety equipment and facilities |
| biosafety level 1 | (n) exposure only to infectious agents that do not ordinarily cause human disease |
| biosafety level 2 | (n) exposure to infectious agents that can cause disease in humans but whose potential for transmission is limited |
| biosafety level 3 | (n) exposure to infectious agents that can be transmitted by the respiratory route and which can cause serious infection |
| biosafety level 4 | (n) 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 |
