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Antibodies in humans to an isolated antigen from oral fusobacteria.

Sera from 31 individuals (19 females, 12 males, 23–58 years) were tested for antibodies agglutinating tanned sheep erythrocytes sensitized with two different preparations of Precipitinogen 2 from Fusobacterium. At 1:8 dilution positive reactions were found in 23 sera (74%). There appeared to be no correlation between titre levels of hemagglutinating antibody and the severity of perio-dontal disease as measured by the Periodontal Index (Russell 1956). 
 
 
 
In 5 out of 8 rabbits given 160 mg human γ-globulin (Kabi) intravenously, intradermal injections 20–45 min later of 0.1 to 0.4 mg of Precipitinogen 2 produced Arthus-like reactions, reaching a maximum after 4–8 hours. Intradermal injections in 6 rabbits of the same quantities of Precipitinogen 2 without previous injection of γ-globulin gave inflammation, sometimes slowly progressive and reaching a maximum after approximately 20 hours. Intravenous injection of 250 μg of endotoxin from Fusobacterium 24 hours after local injection of Precipitinogen 2 produced no change in the appearance of the lesions.