<Tr> <Td> Genus: </Td> <Td> Norovirus </Td> </Tr> <Tr> <Th_colspan="2"> Type species </Th> </Tr> <Tr> <Td_colspan="2"> Norwalk virus </Td> </Tr> <P> Norovirus, sometimes referred to as the winter vomiting bug in the UK and Ireland, is the most common cause of viral gastroenteritis in humans . It affects people of all ages . The virus is transmitted by fecally contaminated food or water, by person - to - person contact, and via aerosolization of vomited virus and subsequent contamination of surfaces . Annually, norovirus is associated with 906,000 outpatient visits in industrialized countries, with 64,200 inpatient hospitalizations . In developing countries, it is associated with 1.1 million hospitalizations, with an estimated 218,000 deaths . </P>

How many cases of norovirus per year uk