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'Bioluminescent' Reporter Phage for the Detection of Category A Bacterial Pathogens

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Typing methods for the plague pathogen, Yersinia pestis.

Luther E Lindler¹

¹Department of Defense, Global Emerging Infections Surveillance and Response System, Armed Forces Health Surveillance Center, 2900 Linden Ln, Silver Spring, MD 20910, USA. Luther.Lindler@us.army.mil

Journal of AOAC International

|September 1, 2009

Summary

Yersinia pestis, the plague agent, is classified into epidemic and endemic strains based on genetic analysis. These strains evolved independently from a common ancestor, with 11 major groups now defined globally.

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Area of Science:

Microbiology
Genetics
Epidemiology

Background:

Phenotypic methods historically classified Yersinia pestis (Y. pestis) isolates into biovars based on biochemical characteristics.
Y. pestis exhibits a relatively monomorphic nature, making genetic subtyping challenging and dependent on the loci analyzed.

Purpose of the Study:

To differentiate Yersinia pestis strains using both phenotypic and genotypic methodologies.
To clarify the evolutionary relationship between different Y. pestis strains and their common ancestor.

Main Methods:

Utilized phenotypic characterization, including nitrate reduction and glycerol fermentation.
Employed Y. pestis genotyping, analyzing multiple genetic loci to resolve strain differences.
Conducted molecular analysis to trace the evolutionary origins of Y. pestis strains.

Main Results:

Identified two primary Y. pestis types: epidemic strains (causing human plague) and endemic strains (primarily virulent in rodents).
Demonstrated that both epidemic and endemic strains originated independently from a common Yersinia pseudotuberculosis ancestor.
Established a global classification system defining 11 major groups of Y. pestis.

Conclusions:

Genetic analysis provides higher resolution for Y. pestis strain differentiation compared to historical phenotypic methods.
Understanding Y. pestis strain diversity is crucial for plague epidemiology and control.
Recent molecular data have refined the classification and evolutionary understanding of Y. pestis.