Table 4.

Adjusted Hazard Ratios for the Risk of Symptomatic Norovirus Diarrhea Caused by GII.4 and GII.6, After Prior Infection With 1 of 8 Genotypes, Among 194 Children With Complete Surveillance Data From Birth Until 24 Months of Age

Genotype of Prior Infection	Adjusted HR (95% CI) for Symptomatic Infection
	GII.4 (n = 92)	GII.6 (n = 51)
GI.3	1.43 (.85–2.40)	1.12 (.50–2.51)
GI.5	0.76 (.30–1.89)	0.78 (.27–2.25)
GI.7	1.19 (.68–2.10)	1.45 (.80–2.61)
GII.2	1.32 (.75–2.30)	1.07 (.48–2.40)
GII.4	0.29a (.18–.48)	1.06 (.59–1.90)
GII.6	1.05 (.65–1.66)	0.70 (.38–1.27)
GII.17	0.76 (.40–1.41)	1.21 (.66–2.21)
GII.23	0.72 (.35–1.48)	0.99 (.52–1.88)

HRs include adjustment for length-for-age z score and the duration of exclusive breastfeeding.

Abbreviations: CI, confidence interval; HR, hazard ratio.

^aHolds after Holm correction (P < .007).