[Fatal case of sepsis with Capnocytophaga canimorsus after a minor dog bite]

Area of Science:

• Infectious Diseases
• Microbiology
• Clinical Medicine

Background:

• Capnocytophaga canimorsus is a bacterium commonly found in the mouths of dogs and cats.
• Infections typically occur after bites or scratches, with a 2-3 day incubation period.
• While often asymptomatic, C. canimorsus can cause severe, rapidly progressing infections.

Observation:

• A previously healthy 54-year-old man developed sepsis following a dog bite and scratch.
• Blood smear microscopy revealed intracellular Gram-negative rods.
• Despite aggressive treatment, the patient succumbed to septic shock, multi-organ failure, and disseminated intravascular coagulopathy.

Findings:

• Extended spleen culture incubation isolated Gram-negative rods identified as Capnocytophaga canimorsus via 16s RNA analysis.
• The patient's fatal outcome highlights the potential for fulminant infection.
• C. canimorsus infection carries a significant lethality rate of 30%.

Implications:

• Risk factors such as asplenia, alcohol abuse, or immunosuppression increase susceptibility.
• Prompt antibiotic administration is critical for managing C. canimorsus infections.
• Antibiotic prophylaxis may be warranted for high-risk individuals exposed to dog bites.