mass infection in primary school, 233 infected

26 Nov., publicly announced

174 children, their families(55 persons) and 4 teachers infected in primary school, Narashino city, Chiba prefecture
Norovirus was detected from 8 children
They are not serious conditions

22 Nov., primary school informed public health center
"84 children have diarrhea or vomit/136 children are absent"
and public health center investigated the infection, conducted health education
24 Nov., norovirus was detected from 8/9 children
26 Nov., public health center confirmed 233 persons

press release by Chiba prefecture http://translate.google.co.jp/translate?js=n&prev=_t&hl=ja&ie=UTF-8&layout=2&eotf=1&sl=ja&tl=en&u=http%3A%2F%2Fwww.pref.chiba.lg.jp%2Fshippei%2Fpress%2Fkobetu%2Fnoro101126.html