Advice on dealing with the highly contagious winter vomiting bug has been issued by Director of Public Health for Calderdale Graham Wardman.
There have been tens of thousands of reports of the norovirus across the country.
It is the most common stomach bug in the UK, affecting people of all ages.
Dr Wardman said: “Norovirus, sometimes called the ‘winter vomiting bug’, is highly contagious but normally short lived and most people get better after about 24 to 48 hours.
“People with symptoms should avoid going to A and E and instead stay at home, ensure they wash their hands thoroughly after using the toilet, avoid contact with others where possible, drink plenty of fluids and let nature take its course.
“They should also avoid visiting relatives in hospitals and care homes until they are fully recovered.
“If after 72 hours there is little or no difference, or the symptoms become worse, an appointment with a GP should be made, or NHS Direct can offer free, confidential advice on 0845 4647.”