Figure. Phylogenetic tree based on a 198-nt region of the gene coding for RNA-dependent RNA-polymerase (located in ORF1), showing patient and water samples and some prototype strains of calicivirus from the GenBank database (accession no.: MX, Mexico U22498; MV, Melksham X81879; HV, Hawaii U07611; LDV, Lordsdale X86557; DSV, Desert Shield U04538; SOV, Southampton L07418; NV, Norwalk M87661; Gothenburg AF365989). Bootstrap values are given in percentage at the nodes.
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