“…Streptococci are mostly responsible for infectious diseases of dental origin [1,5,7,10,18]. They may cause symptoms and such diseases as erythema nodosum, infective arthritis, fever of unknown origin, glomerulonephritis, or bacterial endocarditis [4,12,14]. Following treatment of the infectious focus (by tooth extraction, root resection, antibiotic therapy) the patient's symptoms generally disappear, meaning that the underlying apical periodontitis must be the reason for the observed disease [4,12,14].…”