. Author manuscript; available in PMC: 2013 Jul 1.

Published in final edited form as: Epidemiol Infect. 2012 Mar 26;140(7):1161–1172. doi: 10.1017/S0950268812000234

Table 3.

Comparative analysis of NoV outbreaks associated with genogroup by mode of transmission and outbreak setting.

Variable^*	GI	GII^†	Both GI and GII^†	Total	GII.4^‡
Variable^*	n (row % of total)	n (row % of total)	n (row % of total)	n (column % of total)	n (row % of total)
Transmission
Foodborne	43 (13)^§	211 (66)^§	65 (20)	319 (57)	66 (26)
Person-to-Person	12 (8)^§	123 (87)^§^‖	7 (5)^§^‖	142 (25)	69 (58)^§^‖
Waterborne	18 (31)	22 (37)	19 (32)	59 (10)	11 (21)
Environmental	2 (4)^§	40 (89)^§^‖	3 (7)^§	45 (8)	28 (68)^§^‖
Subtotal	75 (13)	396 (70)	94 (17)	565	174 (37)
Setting
Foodservice	41 (16)^¶	176 (67)^¶	45 (17)^¶	262 (38)	47 (22)^¶
Healthcare	7 (4)	159 (96)	0 (0)	166 (24)	105 (74)
Leisure	15 (15)^¶	76 (74)^¶	12 (12)^¶	103 (15)	45 (51)^¶^**^††
School/Daycare	13 (17)^¶	57 (76)^¶	5 (7)^¶	75 (11)	13 (21)^¶
Other	11 (14)	52 (65)^¶	17 (21)^¶^**	80 (12)	22 (32)^¶
Subtotal	87 (13)	520 (76)	79 (12)	686	232 (40)

Up to three modes of transmission may have been listed per outbreak. Outbreaks may therefore be listed under more than one mode of transmission. Per cents may sum to more than 100 due to rounding.

^†

Includes all GII strains including those lacking a specific GII cluster designation.

^‡

Per cents and total excludes segment of GII strains lacking a specific GII cluster designation.

^§

Significantly different from waterborne transmission types (p < 0.05).

^‖

Significantly different from foodborne transmission types (p < 0.05).

^¶

Significantly different from healthcare settings (p < 0.05).

^**

Significantly different from school/daycare settings (p < 0.05).

^††

Significantly different from foodservice settings (p < 0.05).