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)

Genotype Distribution of Norovirus Outbreaks

* 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.

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Page last reviewed: November 8, 2021