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Microbiology, 2021

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510 13 • Control of Microbial Growth<br />

Figure 13.2 A protective suit like this one is an additional precaution for those who work in BSL-4 laboratories. This suit has its own air<br />

supply and maintains a positive pressure relative to the outside, so that if a leak occurs, air will flow out of the suit, not into it from the<br />

laboratory. (Credit: James Gathany, CDC, public domain)<br />

Figure 13.3<br />

The CDC classifies infectious agents into four biosafety levels based on potential risk to laboratory personnel and the<br />

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