Capnocytophaga canimorsus: Symptoms & Signs

Medically Reviewed on 3/25/2022

Capnocytophaga canimorsus is a type of bacteria that is found naturally in the mouths of dogs and cats. The organism typically does not cause illness in healthy humans.

Symptoms can develop anywhere from 1 to 14 days after exposure in vulnerable people. Symptoms and signs can include

  • blisters around the site of the bite wound within hours of the bite,
  • redness,
  • swelling,
  • draining pus, and
  • pain.

Other associated symptoms can include

Cause of Capnocytophaga canimorsus Infections

Capnocytophaga canimorsus bacteria can cause infection in people with suppressed immune function. The infection can spread through bites, licks, or even close contact with dogs and cats.

Other capnocytophaga canimorsus symptoms and signs

  • Blisters Around the Site of the Bite Wound Within Hours of the Bite
  • Confusion
  • Diarrhea
  • Draining Pus
  • Fever
  • Headache
  • Joint Pain
  • Muscle Pain
  • Pain
  • Redness
  • Stomach Pain
  • Swelling
  • Vomiting


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Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.