Bug spreading across region.
A sickness and diarrhoea bug is sweeping South Wales.
Record numbers of people have already fallen victim to the Norwalk virus, although it is not being treated as an epidemic.
The number of victims of the Norwalk virus have already reached record levels in the first six months of the year.
So far this year a total of 269 cases have been diagnosed, compared to 221 for the whole of 2005.
Doctors believe the e.coli epidemic, which swept through the Valleys last winter with 150 victims, may have now raised public awareness of symptoms which can be similar.
The Norwalk virus causes vomiting, gastric flu, sickness, diarrhoea and fever and lasts from 24 to 48 hours.
It is spread by a lack of toilet hygiene mainly within families with the bug spread by food handling.
Cardiff GP Dr Trevor Thompson said:
'Those experiencing fever, sickness and vomiting should ensure they keep up their fluid intake and not eat for a short time while the symptoms persist.'