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Septicemia and septic arthritis caused by Streptococcus pneumoniae in a cat: possible transmission from a child

B Stallings1, G V Ling, L A Lagenaur

  • 1Small Animal Internal Medicine Service, School of Veterinary Medicine, University of California, Davis 95616.

Insights

A 15-year-old cat developed a severe Streptococcus pneumoniae serotype 23F infection, likely transmitted from an infant. This case highlights potential zoonotic transmission of this common bacterium.

Area of Science:

  • Veterinary Medicine
  • Infectious Diseases
  • Microbiology

Background:

  • Streptococcus pneumoniae is a leading cause of bacterial infections in humans.
  • Zoonotic transmission of S. pneumoniae is considered rare, especially in adult cats.

Observation:

  • A 15-year-old castrated male cat presented with acute illness, exhibiting S. pneumoniae serotype 23F in blood and synovial fluid.
  • The same S. pneumoniae serotype 23F was identified in the nasopharynx of an infant child who frequently interacted with the cat.

Findings:

  • Bacterial isolates from the cat and child were identical, confirming S. pneumoniae serotype 23F as the causative agent.
  • Epidemiological data strongly suggest transmission occurred from the infant to the feline.

Implications:

  • This case provides evidence for the potential zoonotic transmission of Streptococcus pneumoniae serotype 23F from humans to cats.
  • Highlights the importance of considering human-to-animal transmission in veterinary infectious disease diagnostics.

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