Biosafety Level 4 (BSL-4)

Biosafety Level 4 (BSL-4) is the highest safety standard for handling extremely dangerous infectious agents, such as deadly viruses with no known cures or treatments. Facilities operating at BSL-4 are designed with strict security and safety measures, including sealed laboratories, specialized ventilation systems, and protective clothing to prevent any escape of pathogens. Researchers access these labs through multiple security checks, working in controlled environments to prevent infections. The goal is to protect public health and the environment while enabling scientists to study and develop treatments for highly risky diseases.