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Cat-scratch disease. Bacteria in skin at the primary inoculation site
Abstract:
Cat-scratch disease is a zoonotic infection characterized by a skin papule at the site of the scratch followed by regional lymphadenitis. Recently, small gram-negative pleomorphic bacilli were demonstrated in sections of lymph node from patients with the disease. We now report identical bacteria in the primary inoculation site of three patients with cat-scratch disease. Lymph nodes from two of these patients also contained the same bacilli. Identical bacteria in both skin and lymph nodes from these patients are further evidence that the bacilli are the cause of cat-scratch disease. In early infections, biopsy of the primary site of inoculation and demonstration of bacilli may replace excision and histologic examination of lymph node in establishing the diagnosis of cat-scratch disease.
Insights
Cat-scratch disease diagnosis can be improved by identifying small, gram-negative bacteria at the initial scratch site. This finding supports the bacteria as the cause and may simplify early diagnosis of this zoonotic infection.
Area of Science:
- Infectious Diseases
- Microbiology
- Veterinary Medicine
Background:
- Cat-scratch disease (CSD) is a common zoonotic infection.
- CSD typically presents with a skin lesion and swollen lymph nodes (lymphadenitis).
- Small, gram-negative, pleomorphic bacilli have been recently identified in lymph node biopsies of CSD patients.
Observation:
- This study identified identical bacteria in the primary skin lesion of three CSD patients.
- The same bacteria were also found in the lymph nodes of two of these patients.
- The presence of these bacilli in both locations strengthens the evidence linking them to CSD.
Findings:
- The bacteria found in the skin inoculation site are identical to those found in lymph nodes.
- This provides further evidence that these bacilli are the causative agent of cat-scratch disease.
- Biopsy of the primary skin lesion may be a viable alternative to lymph node biopsy for diagnosis.
Implications:
- Early diagnosis of cat-scratch disease may be simplified by examining the primary inoculation site.
- This research could lead to less invasive diagnostic methods for CSD.
- Understanding the primary site of infection aids in diagnosing this zoonotic bacterial disease.