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A. Bray-Curtis principal coordinate analysis (PCoA) shows clustering of fecal samples from puppies in the greater Philadelphia area by C. difficile colonization status and by litter. Fecal samples labeled “Misc.” are from older weaned puppies that were no longer in litters and resided with their owner. B. Relative abundance of the genus Escherichia increases along the x-axis of the PCoA.
