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Map of proposed new and upgraded US biodefense laboratories (biosafety levels 3 and 4).
Note. Facilities at biosafety levels 3 and 4 are authorized to handle dangerous biological materials. Level 4 facilities may handle the most deadly and contagious pathogens like smallpox and Ebola viruses.
Source. Reprinted with permission from the Sunshine Project (available at: http://www.sunshine-project.org).26
