Between Christmas & New Year's, over 200,000 British people contracted norovirus - effectively inducing vomiting, mild fevers, headaches, and diarrhea. It is said to be the biggest outbreak of a norovirus in 5 years (since the last epidemics); many hospital wards have either been placed on red alert or have been shut down to prevent further spread of the disease.
In the weeks following New Year's, officials estimate that an additional 200,000 people have been infected each week, bringing the total number to 2.8 million. Wow!
ps. See the TimesOnline for additional info:http://www.timesonline.co.uk/tol/news/uk/health/article3176710.ece