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

g confirms earlier work, however, that gastric cancers are now uncommon in the United States," says Dr. Chen. "We also found that H. pylori was related to a reduced risk of stroke and lung cancer, and these effects were stronger for the cagA strain, suggesting its mixed role in human health," she says.

H. pylori, an ancient bacterium, lives in the mucous layer lining the stomach where, until recently, it survived for decades. More than half of the world's population harbor H. pylori in their upper gastrointestinal tract. Mainly transmitted in families, the bacterium is usually acquired before age 10. In developing countries H. pylori is still prevalent, but is vanishing in the developed world thanks to better sanitation and widespread use of antibiotics.

To better understand the relationship between H. pylori and the overall death rate, or all-cause mortality, the researchers analyzed data from 9,895 participants in the National Health and Nutrition Surveys (NHANES III), enrolled from 1988 to 1994. Test results for H. pylori and cagA were available on 7,384 subjects at the time of enrollment, and participants were followed until 2000.

There was no association of either H. pylori-positivity or cagA-positivity with all-cause mortality in the population, the researchers found. Participants with and without H. pylori experienced a similar risk of death from all causes. Consistent with past reports, a strong association was observed between H. pylori and gastric cancer mortality, according to the study. Individuals who were H. pylori positive were 40 times more likely to die from gastric cancer. The study also found that participants with cagA-positivity had a 55 percent reduced risk of deaths from stroke compared with their counterparts who were H. pylori negative/ cagA-negative. Participants with cagA-positivity also had a 45 percent reduced risk of deaths from lun
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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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