Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. It represents a year-round disease burden globally, with the highest number of cases during the winter months. Symptoms range in severity and sometimes lead to hospitalisation and death. High-risk groups at increased risk of severe illness or death, include the very young, the elderly, pregnant women, and those with long term health conditions.

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Public Health Wales

Weekly Influenza Activity in Wales Report

Public Health Wales

Annual influenza surveillance and influenza vaccination uptake reports: 2003-2020

Public Health Wales


World Health Organization

Flu vaccination: increasing uptake

National Institute for Health and Care Excellence

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