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CaliciNet Data

Number of Confirmed Norovirus Outbreaks Submitted to CaliciNet by State
September 1, 2017 – November 30, 2017

Confirmed Norovirus Outbreaks Submitted to CaliciNet, by Genogroup
September 1, 2016 – November 30, 2017 (n=739)

Bar graph showing number of confirmed norovirus GI and GII outbreaks submitted to CaliciNet, by genogroup for September 2014 through January 2016. Norovirus GII account for more outbreaks throughout the time period, with a high of 170 outbreaks in February 2015.

See data table for this chart.

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Genotype Distribution of Norovirus Outbreaks
September 1, 2017 – November 30, 2017
(n=45)

Pie chart indicates genotype distribution of norovirus outbreaks (number = 892) from September 1, 2014 to August 31, 2015: 71% were GII.4 Sydney; 11% were GII.6; 5% were GI.2; 4% were GI.3; 2% were GII.17; and 7% were other genotypes.

See data table for this chart.

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Genotype Distribution of Norovirus Outbreaks
September 1, 2016 – August 31, 2017
(n=694)

Pie chart indicates genotype distribution of norovirus outbreaks (number = 180) from September 1, 2015 to January 15, 2016: 15% were GI.5; 18% GII.2; 15% GII.17; 15% GII.4 Sydney; and 37% 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 viruses.

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