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Antibiotics can cause pervasive, persistant changes to microbiota in human gut
Date:11/18/2008

MBL, WOODS HOLE, MAUsing a novel technique developed by Mitchell Sogin of the Marine Biological Laboratory (MBL) to identify different types of bacteria, scientists have completed the most precise survey to date of how microbial communities in the human gut respond to antibiotic treatment.

Sogin, director of the MBL's Josephine Bay Paul Center, and Susan Huse of the MBL, along with David Relman and Les Dethlefsen of Stanford University, identified pervasive changes in the gut microbial communities of three healthy humans after a five-day course of the antibiotic Ciprofloxacin. Their results are reported in the Nov. 18 issue of PloS Biology.

Using very conservative criteria, the scientists identified at least 3,300 to 5,700 different taxa (genetically distinct types) of bacteria in the human distal gut, and antibiotic treatment influenced the abundance of about a third of those taxa.

"You clearly get shifts in the structure of the microbial community with antibiotic treatment," says Sogin. "Some bacteria that were in low abundance prior to treatment may become more abundant, and bacteria that were dominant may decrease in abundance. When you get these shifts, they may be persistent. Some individuals may recover quickly, and others won't recover for many months."

In all the individuals tested in this study, the bacterial community recovered and closely resembled its pre-treatment state within four weeks after the antibiotic course ended, but several bacterial taxa failed to recover within six months.

This raises questions about the health effects of perturbations to the human-microbial symbiosis in the gut, such as may occur with antibiotic treatment. Because specific microbial populations mediate many chemical transformations in the gutand previous studies have related these processes to cancer and obesity, among other conditionschanges in the composition of the gut microbiota could have important, but as ye
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Contact: Diana Kenney
dkenney@mbl.edu
508-289-7139
Marine Biological Laboratory
Source:Eurekalert

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