Journal Article

Epidemics of Gastroenteritis during 2006 Were Associated with the Spread of Norovirus GII.4 Variants 2006a and 2006b

Elise T.-V. Tu, Rowena A. Bull, Gail E. Greening, Joanne Hewitt, Michael J. Lyon, John A. Marshall, Christopher J. McIver, William D. Rawlinson and Peter A. White

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 46, issue 3, pages 413-420
Published in print February 2008 | ISSN: 1058-4838
Published online February 2008 | e-ISSN: 1537-6591 | DOI: http://dx.doi.org/10.1086/525259
Epidemics of Gastroenteritis during 2006 Were Associated with the Spread of Norovirus GII.4 Variants 2006a and 2006b

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Background.Acute gastroenteritis is commonly associated with norovirus genogroup II (GII) infection. Norovirus GII has 17 classified genotypes (GII.1–GII.17), but only 1 norovirus genotype (GII.4) is associated with global epidemics of gastroenteritis. In 2006, an increase in global norovirus activity was observed.

Methods.During the period from December 2005 through August 2006, a total of 231 fecal samples were obtained from patients with acute gastroenteritis from Australia and New Zealand. Norovirus RNA was amplified and sequenced to determine norovirus genotype and relatedness to known epidemic norovirus GII.4 variants.

Results.Two GII.4 variants, designated 2006a and 2006b, were identified in 61.8% and 11.3%, respectively, of the 186 cases investigated. Norovirus 2006a and 2006b have also been implicated as the predominant causes of norovirus-associated gastroenteritis across Europe in 2006.

Conclusions.The global increase in norovirus-associated gastroenteritis in 2006 was linked to the emergence of 2 novel GII.4 variants, 2006a and 2006b.

Journal Article.  4464 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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