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A case of laboratory acquired infection with Escherichia coli O157:H7
A P Burnens1, R Zbinden, L Kaempf
1National Reference Laboratory for Foodborne Diseases, University of Berne, Switzerland.
Abstract:
A case of laboratory-acquired infection with Escherichia coli O157:H7 is presented. Evidence of the identity of the infecting strain was provided by toxin type and plasmid profiles. Because no obvious technical errors in laboratory practices could be demonstrated we conclude that the infecting dose for E. coli O157:H7 may be small. The clinical course was uncomplicated; during reconvalescence, the patient's serum recognized a unique 87 kDa band on immunoblots of the infecting strain.
Insights
A laboratory worker contracted Escherichia coli O157:H7 infection, suggesting a potentially small infectious dose. The patient recovered without complications, showing a unique immune response to the bacterial strain.
Area of Science:
- Microbiology
- Infectious Diseases
- Clinical Laboratory Science
Background:
- Laboratory-acquired infections (LAIs) pose a risk to healthcare professionals.
- Escherichia coli O157:H7 is a significant foodborne pathogen known for causing severe gastrointestinal illness.
- Understanding transmission routes and infectious doses is crucial for laboratory safety protocols.
Observation:
- A case of laboratory-acquired infection with Escherichia coli O157:H7 occurred.
- The infecting strain was confirmed using toxin typing and plasmid profiling.
- No apparent breaches in standard laboratory practices were identified.
Findings:
- The infecting dose of Escherichia coli O157:H7 may be smaller than previously assumed.
- The patient experienced an uncomplicated clinical course.
- During recovery, the patient's serum showed reactivity to a specific 87 kDa protein band of the infecting strain.
Implications:
- This case highlights the potential for low-dose transmission of E. coli O157:H7 in laboratory settings.
- Reinforces the importance of stringent biosafety measures when handling pathogenic bacteria.
- The identified 87 kDa antigen may represent a target for future diagnostic or immunotherapeutic strategies.