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Disappearing bacterium may protect against stroke
Date:1/8/2013

New York (January 9, 2013) -- A new study by NYU School of Medicine researchers reveals that an especially virulent strain of the gut bacterium Helicobacter pylori (H. pylori) isn't implicated in the overall death rate of the U.S. population, and may even protect against stroke and some cancers. The findings, based a nationwide health survey of nearly 10,000 individuals over a period of some 12 years, are published online, January 9, in the journal Gut.

Those individuals carrying the most virulent strain of H. pylori, the study found, had a 55 percent reduced risk of deaths from stroke compared with their counterparts who were not infected with H. pylori. Participants with the most virulent strain also had a 45 percent reduced risk of death from lung cancer.

These surprising findings emerged from an analysis by Yu Chen, PhD, MPH, associate professor of population health and environmental medicine, and Martin J. Blaser, MD, professor of internal medicine and professor of microbiology, of individuals who participated in a national survey designed to assess the health and nutritional status of adults and children in the United States. Previous studies by Dr. Blaser have confirmed the bacterium's link to gastric diseases ranging from gastritis to stomach cancer. He and Dr. Chen have more recently shown that H. pylori may protect against childhood asthma. The most virulent H. pylori strains have a gene called cagA.

"The significance of this study is that this is a prospective cohort of participants representative of the U.S. population with a long follow-up," says Dr. Chen. "We studied both the overall H. pylori as well as cagA strain of H. pylori, which is more interactive with the human body. We found that H. pylori is not related to the risk of death from all causes, despite it being related to increased risk of death from gastric cancer."

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Contact: Lorinda Klein
lorindaann.klein@nyumc.org
212-404-3533
NYU Langone Medical Center / New York University School of Medicine
Source:Eurekalert

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