Raxibacumab (ABthrax) is a human IgG1 monoclonal antibody against Bacillus anthracis protective antigen (PA). Raxibacumab blocks the toxin’s deleterious effects by preventing binding of the protective antigen component of the anthrax toxin to its receptors in host cells, thereby blocking the toxin’s deleterious effects. Raxibacumab can be used for anti-anthrax research.