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CaliciNet Data

Number of Confirmed Norovirus Outbreaks Submitted to CaliciNet by State
September 1, 2017 – August 31, 2018

Confirmed Norovirus Outbreaks Submitted to CaliciNet, by Genogroup
September 1, 2016 – August 31, 2018 (n=1335)

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.

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Genotype Distribution of Norovirus Outbreaks
September 1, 2017 – August 31, 2018
(n=631)

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.

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Genotype Distribution of Norovirus Outbreaks
September 1, 2016 – August 31, 2017
(n=704)

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.

* 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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