Norovirus: What is the winter vomiting bug and how do we treat it?

Yes, flat 7up can help.
Though we're still trying to grapple with the end of summer, it seems winter is already trying to catch up with us, with cases of norovirus rampant in schools and créches.
The 'winter vomiting bug', as it is often known, is seasonal and usually peaks towards the end of winter.