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A total of 6231 fecal specimens collected from infants and children with gastroenteritis in 7 different regions of Japan during 1995 to 2007 were examined for norovirus. Norovirus was detected in 779 patients (12.5%) and norovirus activity peak in the winter season (November to January) during 1995 to 2007. During the last 11 years, NoVGII/4 was the predominant strain in Japan followed by GII/3, GII/6, GII/2, GII/12, and GI.
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Dey et al. (2010) studied this question.
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