Final answer:
The statement that there are four types of control zones based on severity, required personal protective equipment, and procedures is true, referring to the CDC's biosafety levels (BSLs). These levels range from BSL-1, the least severe, to BSL-4 for the most dangerous pathogens like the Ebola virus.
Step-by-step explanation:
The statement about there being four types of control zones based on severity, required personal protective equipment (PPE), and procedures is true. This classification usually refers to biosafety levels (BSLs), which are guidelines for laboratory biocontainment that the Centers for Disease Control and Prevention (CDC) outline. These levels range from BSL-1 to BSL-4.
For example, BSL-1 applies to agents not known to consistently cause disease in healthy adults and represents a minimal level of containment. BSL-2 is for agents that pose moderate hazards. BSL-3 includes agents that can become airborne and cause serious disease. Lastly, BSL-4 is reserved for the most dangerous agents that pose a high risk of aerosol-transmitted laboratory infections and life-threatening diseases for which there are no vaccines or treatments available, such as the Ebola virus.
At each level, the required safety measures and procedures increase in stringency to protect lab personnel and the community from infection and spread of these agents.