HOSPITALS across the UK are having to close wards following an outbreak of a stomach bug.

The Health Protection agency confirmed yesterday that cases of the norovirus, which causes sickness and diarrhoea, have hit a six-year high.

Doctors have estimated that the norovirus is infecting more than 100,000 people every week across the UK, a high not seen since 2002, and a warning was issued by the Royal College of GPs over the increased number of cases this winter.

At least 56 wards in England and Wales have been closed to new patients in an attempt to stop the spread of the virus.

Five wards at Wrexham's Maelor Hospital were closed to new admissions after 70 cases of sickness were found in a ten day period.

Tests are also being carried out at Aberystwyth's Ysbyty Bronglais, where 68 beds across three wards have been closed.

The National Public Health Service for Wales said it was not currently aware of the norovirus spreading above the levels expected and there is usually a rise in the number of cases at this time of year.

NHS Direct also received an influx of calls over the Christmas period and vomiting and abdominal pain was the second highest reason for people calling.

Workers who have the norovirus are advised to remain at home for 48 hours after the symptoms have gone and to avoid surgeries and hospitals.