| NOUN | state | biosafety level | the level of safety from exposure to infectious agents |
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| Meaning | The level of safety from exposure to infectious agents; depends on work practices and safety equipment and facilities. | |
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| Narrower | 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 / 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 | |
| Broader | grade, level, tier | A relative position or degree of value in a graded group |
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