The technology focuses on the development of a tetravalent bispecific antibody effective against Bacillus anthracis, the bacterium responsible for anthrax. This antibody combines the specificities of two monoclonal antibodies (mAbs): one targeting anthrax protective antigen (PA) and the other targeting the bacterial capsule. The anti-PA mAb shows potent toxin-neutralizing activity, while the anti-capsule mAb efficiently kills anthrax bacteria. By merging these specificities into a single lgG framework, the resulting bispecific antibody can simultaneously neutralize toxins and kill bacteria, potentially offering comprehensive protection against anthrax infection. The bispecific antibody is produced from transfected mammalian cells, ensuring scalability for large-scale production. This technology represents a significant advancement in anthrax biodefense, providing a simpler, more effective approach for treatment following exposure to aerosolized B. anthracis spores.