Fig. 1
From: Variation of human norovirus GII genotypes detected in Ibaraki, Japan, during 2012–2018
Relationship between the occurrence of outbreaks for each genotype of NoV and the site of infection. The number of outbreaks of a GI, b GII.2, c GII.4, d GII.6, and e GII.17 is shown as a line graph. Blue indicates cases at childcare and educational facilities, red indicates cases involving food poisoning, orange indicates cases at elderly nursing homes, and green indicates others. The vertical axis shows the number of outbreaks, and the horizontal axis shows the season and month of appearance