CaliciNet Data - Norovirus US Outbreak Map

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Number of Confirmed Norovirus Outbreaks Submitted to CaliciNet by State
September 1, 2018 – April 30, 2019

Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet, by Genogroup
September 1, 2017 – April 30, 2019

Genotype Distribution of Norovirus Outbreaks

September 1, 2018 – April 30, 2019
(n=510)

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.P16-GII.4 Sydney 267
GII.Pe-GII.4 Sydney 12
GII.P4 New Orleans-GII.4 Sydney 4
GI.P3-GI.3 64
GII.P7-GII.6 25
GII.P16-GII.12 23
Other Genotypes 115
Genotype Distribution of Norovirus Outbreaks, current year
Genotype Number of Outbreaks
GII.P16-GII.4 Sydney 317
GII.P4 New Orleans-GII.4 Sydney 33
GII.Pe-GII.4 Sydney 24
GII.P16-GII.2 67
GII.P7-GII.6 28
GI.P6-GI.6 34
Other Genotypes 160

* 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: May 8, 2019
Content source: National Center for Immunization and Respiratory Diseases, Division of Viral Diseases