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Gut microbes influence defense against influenza

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The bacteria in our intestines outnumber by tenfold the 100 trillion cells that comprise the human body. This gut microbiota has many beneficial functions, including the production of vitamins and hormones, fermentation, regulation of gut development, and shaping intestinal immune responses. They also play a role in pathological conditions such as diabetes and obesity, and influence the immune functions of distal mucosal surfaces such as the lung. Examples include the amelioration of allergen-induced asthma by colonization of the stomach with Helicobacter pylori, and involvement of the gut microbiota in development of immune defenses against influenza virus infection.
 
 

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