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Distribution of genotypes in the norovirus-positive samples of the study of Children's Hospital in Washington, DC. A specific norovirus genotype was assigned to 48 of the 50 norovirus-positive samples on the basis of partial polymerase coding sequence. The GII.4 norovirus strains selected for complete genome sequencing in this study are indicated in boldface type. ND*, a specific norovirus genotype could not be determined on the basis of the sequence available.
