UK health bosses have said norovirus cases in England have risen "significantly", with levels among over-65s the highest in more than 10 years.
The majority of outbreaks are in care homes, but there have also been increases in schools and hospitals. Health experts urged people with symptoms to stay at home and not to return to work, or send sick children to school, until 48 hours after symptoms have cleared.
Cases of norovirus are currently running 66% above the average for the past five seasons, according to the UK Health Security Agency (UKHSA).