Pupils will need to stay away from school for 48 hours from the last bout of vomiting or diarrhoea, in order to contain contagious illnesses.
Pupils will need to stay away from school until they are no longer contagious. This is when the last blister has dried into a scab, which is usually around 5-7 days after the onset of the rash.
Please see the following sites for further information regarding schools and illness:
Public Health Agency - Guidance on infection control in schools and other childcare settings
NHS - Is my child too ill for school?