DNA was isolated from 100 mg of frozen feces using the Qiagen DNeasy PowerSoil Pro Kit (Valencia, CA, USA), and metagenomic sequencing was performed by CosmosID, Inc. (Rockville, MD, USA). As previously described [33 (link)], DNA libraries were prepared using the Illumina Nextera XT preparation kit (San Diego, CA, USA). Library quantity was assessed using a Qubit Fluorometer (Thermo Fisher Scientific, Wilmington, DE, USA) and sequenced on an Illumina HiSeq platform to generate 150-bp paired-end reads.
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