The Centers for Disease Control and Prevention assigns the most virulent microbes known to cause human disease to biosafety level 4.

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This statement is true. Biosafety level 4 (BSL-4) is the highest level of biosafety containment and is used for research on the most dangerous pathogens that pose a high risk of causing life-threatening disease with no vaccines or treatments available. Examples of BSL-4 agents include Ebola virus, Marburg virus, and smallpox virus. The CDC and other agencies follow strict safety protocols when working with these agents to prevent accidental exposure and spread of the diseases.

The Centers for Disease Control and Prevention Assigns the Most