Across the UK, consultation rates were just over 15 per 100,000 in the week ending 12 March. NICE's threshold for antiviral use is 30 cases per 100,000.
The age group with the highest level of circulating flu was 20-24 years, at 26 consultations per 100,000. The regions most affected by it were Northern Ireland, London and the South East.
Health Protection Agency data for the same week show a high incidence of vomiting in the North West, Yorkshire and London.