Ayyagari, AAgarwal, K C1978-10-012009-05-291978-10-012009-05-291978-10-01Ayyagari A, Agarwal KC. A modified gel-diffusion technique for testing toxigenicity of Corynebacterium diphtheriae. Indian Journal of Pathology & Microbiology. 1978 Oct; 21(4): 341-5http://imsear.searo.who.int/handle/123456789/74946engCorynebacterium diphtheriae --pathogenicityDiphtheria --etiologyHumansImmunodiffusionA modified gel-diffusion technique for testing toxigenicity of Corynebacterium diphtheriae.Journal Article