Table 1 Number of virus-associated outbreaks due to acute gastroenteritis in Yokohama, Japan

Total of AG outbreaks

1459

(100%)

114

103

93

171

122

161

162

139

135

259

Virus

    Norovirus^a

1327

(90.9%)

104

93

90

155

110

150

150

123

118

234

    RVA

73

(5.0%)

5

6

1

7

4

3

9

8

10

20

    Sapovirus

49

(3.4%)

1

3

2

8

6

8

3

8

6

4

    RVC

10

(0.7%)

4

1

0

1

2

0

0

0

1

1

Setting

    K/Ns^b

504

(34.6%)

11

18

11

59

31

43

67

46

67

151

    PSs^b

413

(28.3%)

40

46

45

54

27

27

40

30

32

72

    NHs^b

256

(17.6%)

30

24

17

21

36

60

25

22

14

7

    Restaurants

143

(9.8%)

16

5

10

19

14

16

13

19

14

17

    Welfare facilities

42

(2.9%)

1

4

5

3

6

4

7

8

1

3

    Hospitals

31

(2.1%)

10

1

2

5

4

4

3

2

0

0

    Junior and senior high schools, universities

16

(1.0%)

5

1

3

1

0

1

0

2

0

3

    Others^c

54

(3.7%)

1

4

0

9

4

6

7

10

7

6