Calicinet Data - Norovirus US Outbreak Map

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

Confirmed Norovirus Outbreaks Submitted to CaliciNet, by Genogroup
September 1, 2017 – November 30, 2018 (n=713)

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=655)

Pie chart indicates genotype distribution of norovirus outbreaks (number = 231) from September 1, 2016 to January 27, 2017: 5% were GII.6; 7% GII.2; 12% GI.3; 3% GII.Pe-GII.4 Sydney; 62% GII.P16-GII.4 Sydney; and 11% were other genotypes.

See data table for this chart.

September 1, 2018 – November 30, 2018
(n=58)

Pie chart indicates genotype distribution of norovirus outbreaks (number = 734) from September 1, 2015 to August 31, 2016: 30% were GII.P16-G.!!.4 Sydney; 18% were GII.Pe-GII.4 Sydney; 13% were GII.2; 10% were GII.17; 7% were GI.5; 7% were GI.3; and 15% were other genotypes.

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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