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This is a case of Capnocytophaga Canimorsus in a previously healthy man with no indications of immunocompromise, reported in literature. C canimorsus was first described in 1961 in a football athlete who had previously had a splenectomy and then sustained a dog bite afterwards. Symptoms appeared within days and severe sepsis was found.

C canimorsus was originally DF-2 (dysgonic fermenter) by the US Centers for Disease Control (US CDC) before 1989 when the Capnocytophaga species are formally classified.

C canimorsus infections are not tracked in the United States as they are rare. The Netherlands has reported less than 0.7 cases per 1 million people per year, but this reporting is subject to bias.

In immunocompetent, healthy individuals, C canimorsus is usually handled well by the immune system. This is even in the case of animal bites. The bacteria is commonly found in dog, cat, rabbit, guinea pig mouths.

These cases are patients who I, or my colleagues have seen. They are de-identified and many instances have been presented in more depth in an academic setting. These videos are not individual medical advice and are for general educational purposes only. I do not give medical advice over the internet, see your own physician in person for that.

Case courtesy of Dr Chris O'Donnell, Radiopaedia . org, rID: 17375

Case courtesy of Dr Yuri Shif, Radiopaedia . org, rID: 26330

Profile view of a male head. Credit: Wellcome Collection

References:
Severe Sepsis and Septic Shock- N Engl J Med 2013; 369:840-851

Eur J Case Rep Intern Med. 2019 Oct 9;6(10):001268. PMID 31742204

N Engl J Med 2015; 373:642-655

Capnocytophaga canimorsus: an emerging cause of sepsis, meningitis, and post-splenectomy
infection after dog- Eur J Clin Microbiol Infect Dis. 2015 Jul;34(7):1271-80. PMID 25828064

Capnocytophaga canimorsus sp. nov. (formerly CDC group DF-2), a cause of septicemia following dog bite, and C. cynodegmi sp. nov., a cause of localized wound infection following dog - J Clin Microbiol. 1989 Feb; 27(2): 231–235.

Butler T, Weaver RE, Venkata Ramani TK, Uyeda CT, Bobo RA, Ryu JS, Kohler RB (1977) Unidentified gram-negative rod infec- tion. A new disease of man. Ann Intern Med 86:1–5

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