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A, Clostridioides difficile assay results from 124 serial stool specimens collected from 32 infants. Shaded/patterned cells indicate age at stool collection; blank cells indicate no stool was collected at that age. B, Molecular epidemiology of 43 C. difficile isolates collected from 23 colonized infants. Abbreviations: EIA, enzyme immunoassay; MLST, multilocus sequence typing; PCR, polymerase chain reaction; SNV, single nucleotide variant.
