CaliciNet Data – Norovirus US Outbreak Map

Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet by State

September 1, 2022 – August 31, 2023

Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet, by Genogroup

September 1, 2021 – August 31, 2023

Genotype Distribution of Norovirus Outbreaks

September 1, 2022 – August 31, 2023 (n=323)

The Other Genotypes category includes genotypes from outbreaks that each make up less than 5% of the total number of outbreaks. These genotypes are: GI.1[P1], GI.2[P2], GI.3[P3], GI.3[P13], GI.4[P4], GI.5[P4], GI.5[P5], GI.6[P6], GI.6[P11], GI.7[P7], GII.1[P33], GII.2[P16], GII.3[P12], GII.3[P25], GII.3[P untypeable], GII.4 Sydney[P4], GII.4 untypeable[P4], GII.4 untypeable[P untypeable], GII.6[P untypeable], GII.7[P7], GII.10[P16], GII.12[P16], GII.13[P21], GII.14[P7], GII.17[P3], GII.17[P31], GIX.1[GII.P15].

* 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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