Elek's gel precipitation test used for diagnosing:
Elek's gel precipitation test is an example of double diffusion in two dimensions. It is used to demonstrate C. dipthariae. Precipitation band: If the strain is toxigenic, the toxin diffuses in the agar, meets with the antitoxin and produces arrow-shaped precipitation band. Nontoxigenic stain will not produce any precipitation line. The precipitate lines would fuse with each other if the toxins produced by die strains are identical.
Corynebacterium Jakeium
Corynebacterium diphtheriae
Clostridium tetani
Clostridium perfringens
JIPMER 2019