The present study indicated that a good agreement existed between the percentage prevelance of the periodontal pathogens, in particular P. gingivalis, P. gingivalis fimA, P. intermedia, T. forsythia, P. nigrescens and C. rectus in the sub-gingival and atherosclerotic plaque samples suggesting that the micoorganisms in the subgingival plaque had significant chance of their presence in atherosclerotic plaque as well contributing to the progression of atherosclerosis and vice-versa.