Laboratory diagnosis of plague
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Published on: July 8, 2011
Abstract:
In response to an outbreak of a plague-like disease in India, the Public Health Laboratory Service (PHLS) in the UK distributed advice on the isolation and identification of Yersinia pestis. Some of the procedures outlined were evaluated using a number of isolates of Y. pestis, complemented with in-house techniques detecting virulence genes or their products. These laboratory investigations are limited in that they are either only indicative or they take too long (48 hours or more), and thus represent a serious delay to the patient. Successful patient management must be based on a case history, and therapy should be started immediately. Laboratory diagnosis will subsequently rule out most pathogens which cause similar infections, yet will still require confirmation by a reference laboratory.
Insights
Rapid identification of Yersinia pestis, the plague pathogen, is crucial for patient care. Current laboratory methods for plague diagnosis are too slow, delaying critical treatment and requiring confirmation by reference labs.
Area of Science:
- Microbiology
- Infectious Diseases
- Public Health
Background:
- An outbreak of a plague-like disease in India necessitated guidance on Yersinia pestis identification.
- The UK's Public Health Laboratory Service (PHLS) provided initial diagnostic recommendations.
Purpose of the Study:
- To evaluate existing laboratory procedures for Yersinia pestis isolation and identification.
- To assess the utility of in-house techniques for detecting virulence factors.
Main Methods:
- Evaluation of PHLS-recommended Yersinia pestis isolation and identification techniques.
- Application of in-house methods targeting virulence genes or their products.
Main Results:
- Laboratory investigations were found to be either indicative or time-consuming (≥48 hours).
- These delays significantly impact timely patient management.
Conclusions:
- Immediate patient management should rely on clinical history, with therapy initiated promptly.
- Laboratory diagnosis, while useful for ruling out other pathogens, requires reference laboratory confirmation and cannot replace urgent clinical assessment.
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