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[Management of epidemics of nosocomial infections]
1CCLIN Paris-Nord, Institut Biomédical des Cordeliers, l'Ecole de Médecine, Paris, France.
Abstract:
Although nosocomial outbreaks contribute less than 10% of all nosocomial infections, they are a significant cause for concern because of their unpredictability, frequent association with instrumentation, and potential lethality in critically-ill patients. Also, they are commonly due to organisms that are atypical or resistant to antimicrobials. As soon as a nosocomial outbreak is suspected, a rigorous investigation should be undertaken. After the appropriate institutional measures, a case-definition should be developed, and the space and time patterns of the cases should be determined. Confirmation should be obtained that the number of cases is larger than usual, and working hypotheses regarding the source and mode of transmission should be developed. Even at this early descriptive stage, recommendations for prevention should be made. If needed, the investigation should be carried further by a case-control study aimed at identifying risk factors, a molecular analysis of the organisms, and examination of samples taken from the environment. A review of hygiene procedures is useful in many cases.
Insights
Nosocomial outbreaks, though rare, pose significant risks due to unpredictable spread and resistant organisms. Prompt investigation and hygiene reviews are crucial for effective control and prevention in healthcare settings.
Area of Science:
- Infectious Disease Epidemiology
- Hospital-Acquired Infections
Context:
- Nosocomial outbreaks represent a small fraction of hospital-acquired infections but are highly concerning.
- These outbreaks are often linked to medical devices and can be fatal for critically ill patients.
- They frequently involve unusual or antimicrobial-resistant pathogens.
Purpose:
- To outline a systematic approach for investigating suspected nosocomial outbreaks.
- To emphasize the importance of early detection, descriptive epidemiology, and hypothesis generation.
- To guide further investigations, including risk factor analysis and environmental sampling.
Summary:
- Upon suspicion of a nosocomial outbreak, immediate institutional measures and development of a case definition are necessary.
- Analyzing spatial-temporal patterns and confirming an excess of cases are key initial steps.
- Developing working hypotheses and implementing preventive recommendations should occur early in the investigation.
- Further steps may include case-control studies, molecular analysis, and environmental assessments to identify sources and transmission modes.
- Reviewing and reinforcing hygiene protocols is a critical component throughout the process.
Impact:
- Facilitates rapid and effective response to nosocomial outbreaks, minimizing patient harm.
- Enhances understanding of outbreak dynamics, aiding in targeted prevention strategies.
- Contributes to improved patient safety and infection control within healthcare facilities.