CaliciNet Data - Norovirus US Outbreak Map

Number of Confirmed Norovirus Outbreaks Submitted to CaliciNet by State
September 1, 2019 – February 29, 2020

Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet, by Genogroup

September 1, 2018 – February 29, 2020

Genotype Distribution of Norovirus Outbreaks

September 1, 2019 – February 29, 2020 (n=300)

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.

Genotype Distribution of Norovirus Outbreaks, previous year
Genotype Number of Outbreaks
GII.4 Sydney[P16] 162
GII.6[P7] 22
GII.3[P12] 14
GII.2[P16] 13
Other Genotypes 89
Genotype Distribution of Norovirus Outbreaks, current year
Genotype Number of Outbreaks
GII.4 Sydney[P16] 323
GI.3[P3] 99
GII.6[P7] 32
Other Genotypes 210

* 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: February 20, 2020