Cellulitis and transient bacteremia by Capnocytophaga canis after a cat scratch in an immunocompetent patient

Domingo Fernández Vecilla, Estíbaliz Ugalde Zarraga, Mikel Joseba Urrutikoechea-Gutiérrez, Francesco Renzi, José Luis Díaz de Tuesta del Arco

Research output: Contribution to journalArticlepeer-review


Capnocytophaga canis is still a rare cause of infection. We present a case of an immunocompetent patient admited in the hospital with functional impotence, pain and erythema in his left leg after suffering two scratches from his cat 48 h ago. After obtaining blood and wound cultures, broad-spectrum antimicrobial therapy with intravenous amoxicillin clavulanate was initiated. After 1 day and with a clear improvement of the symptoms the patient was discharged from the hospital with cellulitis and transient bacteremia as diagnosis and completing 1 week of antimicrobial therapy orally. After 80 and 92 h of incubation, both anaerobic flasks were positive. In the Gram-stain Gram-negative rod-shaped bacteria could be observed. Despite subculturing in brucella blood agar, tripticase soy agar with 5 % of sheep blood and chocolate agar, in both anaerobic and microaerophilic conditions, the strain could not be recovered. However, these Gram-negative rods could be identified as C. canis by 16S rRNA sequencing, Capsular typing was performed to study the strain, but none of the studied capsule-types tested positive. C. canis is still a rare cause of human infection, but it must be considered in the differential diagnosis of infections related to bites, scratches and licks from dogs or cats.
Original languageEnglish
JournalAccess Microbiology
Issue number5
Publication statusPublished - 18 May 2022


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