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Nucleotide sequence alignment for norovirus outbreak isolates. The sequence alignment was performed using MegAlign, version 5.03. Dots indicate identity to the water sample isolate. Dashes indicate sequence deletions to one or more strains. Norwalk virus was used as the genogroup I control, and P99-006 was used as the genogroup II control. P99-006 is most closely related to genogroup II, subtype 4.
