Fig. 2. Biohazard sign (different designs)
Source: Public domain
Fig. 3. Examples of biological risk factors and their potential implications
Sources: Virus – Public domain, graphics by CDC/ Alissa Eckert, MSMI; Dan Higgins, MAMS;
Bacteria – Public domain, graphics by CDC/ Evangeline Sowers, Janice Haney Carr; Fungi – Public domain, graphics by CDC/ Dr. Hilliard F. Hardin