Why has norovirus been so bad this winter?


A new strain of norovirus may be the reason for the sharp rise in cases of the vomiting bug this winter.

The Health Protection Agency has done tests which show there is a new variant called Sydney 2012 which has become the dominant strain in England and Wales.

It spreads quickly because people are less immune to it.

More than a million people are thought to have had norovirus since the summer, that is 63% higher than this time last year.

Dr Paul Cleary is from the Health Protection Agency.

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.