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Phylogenetic tree based on 300-nucleotide capsid fragment (ORF2) of Italian strains of human (•) and environmental (▪) origin and other norovirus strains. Tree constructed by using Bionumerics version 6.5 using UPGMA (unweighted-pair group method using average linkages) bootstrap values of >90% is shown. Genotypes and GenBank accession numbers are indicated. NoV, norovirus; HuNoV, human norovirus; NLV, Norwalk-like virus.
