Working with biosafety Level 3 agents requires:
a. U.S. Department of Agriculture (USDA) credentials and a postgraduate degree in microbiology or a related field.
b. laboratory design features that control air movement.
c. personnel to wear protective clothing and devices and enter a decontaminating chamber before leaving.
d. workers to have blood samples routinely tested to rule out infection or contamina-tion.
B
Biological agents are classified into levels, based on their degree of potential harm, from nonha-zardous (Level 1) to the most hazardous (Level 4).
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