At the same time, populations of several potentially damaging microbes enhanced. Some antibiotic-resistant bacteria had migrated into the bloodstream of 20% of individuals. The DNA extraction solutions applied in this study have been described in detail previously . Briefly, chemical, heat, and mechanical techniques have been employed to lyse the bacterial cells found in stool samples. The extracted DNA was purified employing a phenol-chloroform-isoamyl wash,

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