Over 100,000 people were struck down with the winter vomiting bug over Christmas.
For every reported case of norovirus in England Wales, an estimated 288 were not flagged up, meaning around 1.12 million could have contracted the illness around Christmas, according to the Health Protection Agency.
This is roughly 100,000 more than the pre-Christmas period - until December 23 - when 1.01 million people were thought to have been struck by the bug.
More top news
The royal couple have felt the sand between their toes at the famous Sydney beach.
Researchers also found there was no difference in survival between men and women, although a higher proportion of men saw a reduction in tum
Fog and Mist patches in parts of England and Wales