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Case report
First reported case of lead-related infective endocarditis secondary to Capnocytophaga canimorsus: ‘Dog Scratch’ endocarditis
  1. Gareth Squire and
  2. Simon Hetherington
  1. Department of Cardiology, Kettering General Hospital, Kettering, Northamptonshire, UK
  1. Correspondence to Dr Gareth Squire; gsquire154{at}


A 76-year-old woman presented with a 6-week history of malaise, night sweats and recurrent fever. She had a background of dilated cardiomyopathy for which she had a cardiac resynchronisation device in situ. She had several hospital admissions across this time with differing diagnoses offered. She received multiple courses of antibiotics with short-term symptom resolution. Blood cultures grew Gram-negative rods and samples were sent to a specialist centre for subtype analysis. A transthoracic echocardiogram revealed thickening of the distal right ventricular lead. A transoesophageal echocardiogram demonstrated a clearer vegetation on this lead. It transpired that she had been scratched by her dog a fortnight before symptom onset. The causal bacterium was reported as Capnocytophaga canimorsus, a bacterium that exists almost exclusively in the saliva and claws of dogs and cats. She received an extended course of antibiotics with eventual removal of the infected device.

  • valvar diseases
  • cardiovascular system
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  • Contributors GS wrote the manuscript, SH acted as senior author.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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