Public Health England carries out a broad spectrum of work relating to prevention of infectious disease.
This work includes infectious disease surveillance, providing specialist and reference microbiology and microbial epidemiology, co-ordinating the investigation and cause of national and uncommon outbreaks, advising government on the risks of various infections and responding to international health alerts.
From 1 April 2013, HPA is part of Public Health England.
Norovirus is the most common cause of infectious gastroenteritis (diarrhoea and vomiting) in England and Wales. PHE posts regular reports about norovirus infection rates throughout the peak season.
Influenza occurs most often in winter and usually peaks between December and March in the northern hemisphere. Illnesses resembling influenza that occur in the summer are usually due to other viruses.