CaliciNet Data - Norovirus US Outbreak Map

Number of Confirmed Norovirus Outbreaks Submitted to CaliciNet by State
September 1, 2019 – December 31, 2019

Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet, by Genogroup
September 1, 2018 – December 31, 2019

Genotype Distribution of Norovirus Outbreaks

September 1, 2019 – December 31, 2019
(n=124)

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] 59
GII.3[P12] 9
GII.6[P7] 13
GI.3[P3] 6
GII.2[P16] 9
Other Genotypes 28
Genotype Distribution of Norovirus Outbreaks, current year
Genotype Number of Outbreaks
GII.4 Sydney[P16] 323
GI.3[P3] 97
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: January 6, 2020