Norovirus bug: Surge in number of cases in Wales

A surge in the number of cases of the winter vomiting bug norovirus has been reported.

The Health Protection Agency says laboratory tests in Wales and England show the numbers of reported cases are up by 72% on the same period last year.

Dr Roland Salmon, consultant epidemiologist for Public Health Wales, told BBC Radio Wales' Bethan Rhys Roberts what effect the bug can have.