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Tips from the journals of the American Society for Microbiology
Date:2/16/2011

ther, they were relatively impotent.

This research made sense of the earlier experiments, "while highlighting the importance that host genetics can play in the dance between host and pathogen, and how it can influence the phenotype of a potential virulence factor," says Miller.

Moreover, these findings "demonstrate for the first time that the capsule is a Y. pestis virulence factor in a mouse infection model," says James Bliska of Stony Brook University, New York. "It had already been shown that [the capsule] is important for flea transmission, and therefore it was clear why [the capsule] was conserved in Y. pestis."

The research is critical for the development of a vaccine against both bubonic and pneumonic plague, also caused by Y. pestis, because considerable effort has been invested in establishing Caf1, an antigen within the capsule, as a protective antigen in vaccines against plague. But all the papers showing that removing the capsule had no effect on virulence had gradually undermined the case for using the capsule antigen in a vaccine, when it had been a major target for vaccine development. But now, "This paper may revive hope that Caf1 in conjunction with other antigens would be a useful component of a multivalent vaccine," says Eric Krukonis of the University of Michigan, Ann Arbor.

Developing such vaccines is important because "Y. pestis is still a major threat to humans, due to endemic pockets of Y. pestis-infected animals and fleas and potential bioterrorism use," Miller and her collaborators note. "A greater understanding of the requirement of the capsule for Y. pestis to cause disease is required. It is particularly important to investigate if natural capsule mutants are able to cause disease and in what contexts, as the current vaccine potentially would not protect against these strains."

(E.H. Weening, J.S. Cathelyn, G. Kaufman, M.B. Lawrenz, P. Price, W.E. Gold
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Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert

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