Figure 1

Characteristics of noroviruses detected in acute gastroenteritis outbreaks reported in Belgium. A) Monthly distribution of norovirus (NoV)-associated outbreaks in Belgium from December 2007 to December 2010. Months corresponding to the primer detection of novel NoV genotypes (GII.e and GII.g) or sub-lineages (GII.4 variants 2007, 2008 and 2010) are indicated by an arrow; Diversity of NoV genogroups (B), genotypes and GII.4 sub-lineages (C) detected in gastro-enteritis outbreaks in Belgium during 2006 and 2010. Percentages of genogroup prevalence are indicated in the vertical bars. Typing results were obtained by phylogenetic clustering with reference strains (http://www.noronet.nl) either for the partial polymerase gene sequence (grey) or the partial capsid gene sequence (black).