Extracts of strains of Corynebacterium diphtheriae var. mitis avirulent, C. hofmannii, C. xerosis, C. parvum and an unidentified Corynebacterium species were tested for antiviral activity against laboratory strains of echovirus type 11, adenovirus type 2 and vaccinia, and a recent isolate of herpes simplex virus. Unlike a previous study, no appreciable antiviral activity was detected in the extracts tested
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