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Analysis of a cluster of 5 norovirus cases in hospitalized patients. A, Timeline of sampling. B, Phylogenetic tree showing the relationships. The tree was rooted with GII.3 (GenBank accession number GU9805851) and nodes supported by a posterior probability ≥0.9 or ≥0.7 are indicated with asterisks and a single dagger, respectively. The gray box highlights patients A and B, who appear linked by the same infection.
