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UT Public Health researchers find link to severe Staph infections
Date:12/23/2008

Researchers at The University of Texas School of Public Health recently described studies that support the link between the severity of community-acquired antibiotic-resistant Staphylococcus aureus (CA MRSA) infections and the Panton Valentine leukocidin (PVL).

The Panton Valentine leukocidin is made up of two components - LukF-PV and LukS-PV - and is typically produced by community-acquired methicillin-resistant S. aureus (CA MRSA). In the United States this strain is the most common CA MRSA isolate and can cause severe skin infections, pneumonia, bloodstream infections and surgical wound infections.

This work has identified using animal models that the PVL leukotoxin can be used as a vaccine against infections caused by CA MRSA. Results from the research will be published in the December issue of Clinical Microbiology and Infection.

According to the Centers for Disease Control and Prevention, the antibiotic-resistant USA300 CA MRSA strain is typically acquired by persons through contact with the bacteria. This Staph strain is not typically associated with hospitalizations or medical procedures.

Eric Brown, Ph.D., assistant professor of infectious diseases at the UT School of Public Health and colleagues also tested the virulence of PVL in CA MRSA by using clinical strains of USA300 that did and did not contain the pore-forming toxin.

"The bacteria is not the same as it was several years ago. It has all of the weapons and toxins that other strains don't have, which makes it easier for this strain to survive efficiently inside of cells," Brown said.

"Immunity directed against LukS was more efficient in protecting mice against a USA300 infection compared to mice vaccinated with LukF-PV or alpha toxin," Brown said. His research found that LukS-PV was effective at protecting against certain types of infections reinforcing the importance of this virulence factor
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Contact: Jade Waddy
jade.waddy@uth.tmc.edu
713-500-3307
University of Texas Health Science Center at Houston
Source:Eurekalert

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