Biosafety Level 4 (BSL-4) is the highest level of biocontainment used in laboratories to handle dangerous pathogens. Facilities operating at this level work with microorganisms that can cause severe or fatal diseases in humans, such as the Ebola virus and Marburg virus. BSL-4 labs are designed to prevent any exposure to these pathogens, employing strict safety protocols and specialized equipment. In a BSL-4 lab, researchers must wear full-body, air-supplied suits to protect themselves from potential infection. The laboratory is equipped with advanced ventilation systems and is isolated from other areas to ensure that no harmful agents escape. These stringent measures are crucial for safeguarding public health and preventing outbreaks.