Most people have mild symptoms that may not need treatment other than resting and drinking plenty of fluids. However you should see a doctor if you:

• have a fever (high temperature) above 38.5C.
• have blood in your diarrhoea or vomit.
• are becoming dehydrated- ie. passing less urine, dry mouth, feeling dizzy/light-headed, headaches, weakness/fatigue etc.
• have severe abdominal (tummy) pains.
• have symptoms lasting longer than 3 days.
• feel your symptoms are worsening.
• are pregnant.
• are elderly or have an underlying health problem such as diabetes, epilepsy, inflammatory bowel disease, kidney disease or other chronic health problems.
• have a weakened immune system (for example, due to cancer, chemotherapy, long term steroid treatment, HIV infection).