Incubation periods of viral gastroenteritis: a systematic review

BMC Infectious Diseases

Table 3 Percentiles of the time of symptom onset and dispersion for disease distributions

	Estimate (95% CI) of time of symptom onset (days)^*					Dispersion (95% CI)
	5th percentile	25th percentile	50th percentile (median)	75th percentile	95th percentile	Dispersion (95% CI)
Astrovirus	-	4.0 (3.5-4.9)	4.5 (3.9-5.2)	5.3 (4.4-5.8)	-	1.22 (1.04-1.30)
Caliciviruses
Noroviruses ^**	0.5 (0.5-0.5)	0.9 (0.8-0.9)	1.2 (1.1-1.2)	1.7 (1.6-1.7)	2.6 (2.6-2.8)	1.64 (1.61-1.71)
Genogroup I ^α	0.4 (0.4-0.5)	0.8 (0.7-0.8)	1.1 (1.1-1.2)	1.6 (1.6-1.7)	3.0 (2.8-3.2)	1.82 (1.75-1.90)
Genogroup II ^β	0.6 (0.5-0.6)	0.9 (0.9-1.0)	1.2 (1.2-1.3)	1.6 (1.6-1.7)	2.5 (2.4-2.6)	1.56 (1.49-1.62)
Sapoviruses ^***	0.9 (0.7-1.0)	1.3 (1.1-1.4)	1.7 (1.5-1.8)	2.3 (2.0-2.4)	3.3 (2.7-3.8)	1.48 (1.36-1.61)
Rotavirus	-	1.6 (1.1-1.9)	2.0 (1.4-2.4)	2.5 (1.8-3.0)	-	1.37 (1.25-1.73)

^*Based on a log-normal distribution of the incubation period; 5th and 95th percentiles are not presented for viruses with fewer than 20 observations. ^** The Genogroups I and II group contains all “Norwalk-like viruses” including Norwalk, Montgomery County, Snow Mountain, Hawaii, Mexico, and other antigenically related strains. ^α The prototype strain for Genogroup I is the Norwalk virus. This group contains all strains antigenically related to the Norwalk virus, which are collectively termed “noroviruses”. ^β The noroviruses in Genogroup II are more closely related to the noroviruses in Genogroup I than the sapoviruses, however are antigenically distinct from viruses in both groups. The prototype virus for Genogroup II is the Snow Mountain Agent. ^*** The prototype virus for the sapoviruses is the Sapporo virus. This group contains all strains antigenically related to the Sapporo virus, which are collectively termed “sapoviruses”.

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