Role of viruses in periodontal diseases...... Do they really HARM !!

My book is on viruses and their close association with the periodontal diseases.. as we all know that periodontitis is infection inflammatory disease which is caused by many microorganisms including no of bacterias, but with the increasing technologies study has shown that viruses increases the severity of periodontal diseases, chronic as well as aggressive. the most important viruses being are herpes virus, ebstein barr and human cytomegalo viruse. so in this book you will be studying about the role, classification, structure, prevalence, association and methods to diagnose them.