Calicinet Data - Norovirus US Outbreak Map

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Number of Confirmed Norovirus Outbreaks Submitted to CaliciNet by State
September 1, 2018 – February 28, 2019

Number of Confirmed Norovirus Outbreaks
Submitted to CaliciNet, by Genogroup
September 1, 2017 – February 28, 2019 (n=966)

Bar graph showing number of confirmed norovirus GI and GII outbreaks submitted to CaliciNet, by genogroup. Norovirus GII account for more outbreaks.

See data table for this chart.

Genotype Distribution of Norovirus Outbreaks

September 1, 2017 – August 31, 2018
(n=659)
Pie chart indicates genotype distribution of norovirus outbreaks (number = 655) from September 1, 2017 to August 31, 2018: GII.P16-GII.4 Sydney : 48%, Other Genotypes : 24%, GI.P6-GI.6 : 5%, GII.P7-GII.6: 4%, GII.P16-GII.2 : 10%, GII.Pe-GII.4 Sydney: 4%, GII.P4 New Orleans-GII.4 Sydney : 5%

See data table for this chart.

September 1, 2018 – February 28, 2019
(n=307)
Pie chart indicates genotype distribution of norovirus outbreaks (number = 228) from September 1, 2018 to January 31, 2019: GII.P16-GII.4 Sydney: 49%, Other Genotypes: 25%, GII.P16-GII.12 : 8%, GII.P7-GII.6: 6%, GI.P3-GI.3 : 10%, GII.P4 New Orleans-GII.4 Sydney : 1%, GII.Pe-GII.4 Sydney : 1%

See data table for this chart.

* 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: March 4, 2019
Content source: National Center for Immunization and Respiratory Diseases, Division of Viral Diseases