Norovirus particles
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How close is a vaccine for the winter vomiting bug?

2 January 2013 Last updated at 18:15 GMT

With the number of case of the winter vomiting bug exceeding 1.1 million in England and Wales according to latest figures, how close are is a vaccine against norovirus?

Professor John Oxford is a professor of Virology at Queen Mary College in London and chair of the Global Hygiene Council.

He spoke to Eddie Mair on Radio 4's PM