Transmission of T. Forsythia to humans from a dog bite

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Tannerella forsythia

(A) A wild-type T. Forsythia cell. (B) A mutant T. Forsythia cell that is S-layer deficient. [1].


T. Forsythia is a bacterium found within the mouths of mammals and primates. It is mostly found in the oral cavities of humans, dogs, cats, and monkeys. When a gram stain is applied, it is known to be Gram-negative and survives under anaerobic conditions. T. Forsythia only appears in culture from the mouths of mammals with periodontal diseases. These diseases include gingivitis, which is characterized by tissue inflammation, and periodontitis, which is characterized by alveolar bone resorption and bone loss. This bacterium is labeled under the species Bacteroidetes, which led to its original name, Bacteroides forsythia. It has a short, rod-shaped body, and its lack of a flagellum or pili make it non-motile. This lack of mobility or any sort of attachment appendage causes it to be reliant on a biofilm in the form of plaque for it to attach to the surface of teeth or other periodontal tissues. They also have an S-layer comprised of glycoprotein that protects both the inner and outer membranes of the cell. []

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Legend/credit: Electron micrograph of the Ebola Zaire virus. This was the first photo ever taken of the virus, on 10/13/1976. By Dr. F.A. Murphy, now at U.C. Davis, then at the CDC.
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