When it comes to handling microorganisms, there are 4 biosafety levels.

• Biosafety level 1 (BSL-1) organisms are harmless.
• BSL-2 organisms include most of the commonly encountered bugs, including things like E. coli, Salmonella and Staphylococcus aureus. They can cause serious disease but infections are often treatable and they can be handled safely with

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