We report the closed genome sequence of a Lactobacillus johnsonii strain (NCK2677) that was isolated from a cefoperazone-treated mouse model designed for the study of Clostridioides difficile infection. Illumina and Nanopore sequencing reads were assembled into a circular 1,951,416-bp chromosome with a G+C content of 34.7%, containing 1,865 genes.
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