A patient goes to the dentist with an abscess.The physician cultures the tooth.Which of the following bacteria is most likely causing this infection?

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Anaerobic gram-negative bacilli are frequently found in mixed infections, causing abscesses and sepsis.B.fragilis often is isolated from soft tissue infection.P.asaccharolytica is widely distributed in human tissues and fluids, whereas P.gingivalis and P.endodontalis are associated primarily with oral infections.

A Patient Goes to the Dentist with an Abscess