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Setting and mode of transmission of 45 calicivirus outbreaks investigated during the period of December 1998 to February 2004 and distribution of human calicivirus strains according to setting (A) and transmission (B). SV, sapovirus; GI, genogroup I norovirus; GII, genogroup II norovirus; GI+, GII+, and GI+GII, >1 strain belonging to genogroup I and/or genogroup II.
