The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
Use at an assay dependent dilution.
Corynebacterium diphtheriae is a gram-positive, nonmotile bacteria found in soil and animal feces. C. diphteriae infect the epithelial cells of the upper respiratory tract from where they produce and secrete a potent toxin. This toxin is absorbed and disseminated through lymph channels and blood to the susceptible tissues of the body.
Corynebacterium diphtheriae toxoid antibody
Diphtheria Toxin antibody
has not yet been referenced specifically in any publications.