SUMMARY: Fusiforms isolated from saliva and gingival debris were allocated on morphological, cultural and biochemical grounds to A and B (Hadi & Russell, 1968). The viable count of such fusiforms increases significantly in both saliva (Hadi & Russell, 1968) and gingival material (Hadi & Russell, 1969) in cases of acute ulcerative gingivitis (A.U.G.).

Few investigations have been made of the nutritional requirements of fusobacteria (Omata, 1953, 1959; Coles, 1968) and no work done on leptotrichiae. The present study was undertaken to determine the vitamin, purine and pyrimidine requirements of oral fusobacteria and leptotrichiae.


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