CaliciNet Data - Norovirus US Outbreak Map

Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet by State

September 1, 2019 – July 31, 2020

Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet, by Genogroup

September 1, 2018 – July 31, 2020

Genotype Distribution of Norovirus Outbreaks

September 1, 2019 – July 31, 2020 (n=345)

Genotype Distribution of Norovirus Outbreaks

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: August 11, 2020