A nurse issued an urgent health warning over a nasty strain of norovirus, also known as the "winter vomiting bug". The horrible illness is already wreaking havoc across the UK with a 29% surge in cases between September 23 and October 6.The stomach bug, known for its highly unpleasant symptoms including vomiting and diarrhoea, is usually short-lived, resolving itself within two days, as per NHS definitions.