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Pasteurella multocida infectious arthritis
Abstract:
Pasteurella multocida, a small gram-negative rod, is a domestic animal saprophyte that occasionally causes disease in humans. Infectious arthritis may develop from a superficial animal bite or scratch. Nine previous cases of infectious arthritis due to this organism have been documented in the literature, and a tenth case is reported here. Most patients had recent animal exposure, and half the patients had underlying chronic rheumatoid arthritis. Clinical signs of inflammation were consistently present; however, systemic infection was infrequent. The lack of positive synovial fluid gram-stain smears may make differentiation from other forms of infectious arthritis difficult. Penicillin in moderate doses is effective therapy, with osteomyelitis developing in only two patients. The tendency for this syndrome to affect patients with rheumatoid arthritis may reflect deficient local defense mechanisms, chronic steroid therapy, or increased ownership of pets. The mechanism of spread of infection to the joint space appears to be through contiguous spread from a skin site rather than by the hematogenous route in most cases.
Insights
Pasteurella multocida can cause infectious arthritis, particularly in individuals with rheumatoid arthritis, following animal contact. Early penicillin treatment is effective, preventing severe complications like osteomyelitis.
Area of Science:
- Infectious Diseases
- Rheumatology
- Microbiology
Background:
- Pasteurella multocida, a common animal bacterium, can cause human infections, including infectious arthritis, often following animal bites or scratches.
- Infectious arthritis from Pasteurella multocida is rare, with only ten cases documented, including the one presented.
- Patients with rheumatoid arthritis are disproportionately affected, suggesting potential immune system vulnerabilities.
Observation:
- The tenth reported case of Pasteurella multocida infectious arthritis is presented.
- Clinical signs of inflammation were consistently observed in affected patients.
- Systemic infection was infrequent, and synovial fluid Gram stains were often negative, complicating diagnosis.
Findings:
- Recent animal exposure was a common factor among patients.
- Half of the patients had pre-existing chronic rheumatoid arthritis.
- Penicillin demonstrated effectiveness as a treatment, with osteomyelitis occurring in only two patients.
Implications:
- The susceptibility of rheumatoid arthritis patients may relate to immune status, steroid use, or pet ownership.
- Infection likely spreads to the joint via contiguous spread from skin rather than hematogenous seeding.
- Prompt diagnosis and penicillin therapy are crucial for favorable outcomes in Pasteurella multocida infectious arthritis.