CaliciNet Data – Norovirus US Outbreak Map
Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet by State
September 1, 2020 – September 30, 2021
Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet, by Genogroup
September 1, 2019 – September 30, 2021
Genotype Distribution of Norovirus Outbreaks
September 1, 2020 – September 30, 2021 (n=172)
* Percent of total number of outbreaks shown in bar chart for each genotype category
The Other Genotypes category includes genotypes from outbreaks that each make up less than 5% of the total number of outbreaks.
* Dual typing for norovirus is being implemented by laboratories participating in CaliciNet. Dual typing is RT-PCR amplification of a partial region of both the polymerase gene and the capsid gene (region B-C) in a single reaction for genogroup I or genogroup II noroviruses.
Page last reviewed: November 8, 2021