The Laboratory Biosafety Manual, fourth edition, published by the World Health Organization, provides comprehensive guidelines on the design and maintenance of laboratories to ensure biosafety. It covers risk assessment, basic and advanced design considerations, and safety measures for laboratory personnel. The manual also addresses emergency response, containment measures, and laboratory closure procedures. It aims to guide laboratory professionals and organizations in implementing effective biosafety practices. The intended audience includes laboratory designers, safety officers, and public health officials involved in laboratory operations and safety management.