Additional File 1.

Genogroup shift during the 2003 outbreak. This data shows how one genogroup of HEV71 replaced another during an HEV71 outbreak. Closed bars represent HEV71 genogroup C1 and hatched bars represent HEV71 genogroup B5. The left Y axis indicates numbers of isolates. The closed circles represent percentage of genogroup B5 viruses isolated and the percentage is indicated on the right Y axis.

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Podin et al. BMC Public Health 2006 6:180   doi:10.1186/1471-2458-6-180