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Table 1 Summary of NoV outbreaks reported in Yokohama, Japan from September 2007 to August 2015

From: Norovirus genotype distribution in outbreaks of acute gastroenteritis among children and older people: an 8-year study

  K/Ns PSs NHs
0–5 years old 6–12 years old >60 years old
Season Outbreaks Tested samples Positive samples Outbreaks Tested samples Positive samples Outbreaks Tested samples Positive samples
2007–2008 10 50 36 33 267 153 28 200 90
2008–2009 16 74 60 41 181 133 21 148 73
2009–2010 10 58 36 43 173 138 17 57 53
2010–2011 51 218 145 47 151 129 21 96 66
2011–2012 28 112 85 21 79 63 34 139 103
2012–2013 39 195 132 24 74 67 58 328 204
2013–2014 57 207 153 40 150 120 25 116 85
2014–2015 37 180 133 25 141 87 20 106 69