Andrea Piacquadio
                                ? Credits

                                Influenza seasonal

                                  Overview

                                  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. It causes illnesses that range in severity and sometimes lead to hospitalization and death.

                                  Most people recover from fever and other symptoms within a week without requiring medical attention. However, influenza can cause severe illness or death, particularly among high risk groups including the very young, the elderly, pregnant women, health workers and those with serious medical conditions.

                                  In temperate climates, seasonal epidemics occur mainly during winter, while in tropical regions, influenza may occur throughout the year, causing outbreaks more irregularly.

                                  Symptoms

                                  Seasonal influenza is characterized by a sudden onset of fever, cough (usually dry), headache, muscle and joint pain, severe malaise (feeling unwell), sore throat and a runny nose. The cough can be severe and can last two or more weeks.

                                   
                                  Treatment

                                  For patients that are not in a high risk group, treatment focuses on relieving symptoms of influenza such as fever. Patients that are known to be in a group at high risk for developing severe or complicated illness should seek medical attention and should be treated with antiviral drug as soon as possible.

                                  4 types of

                                  seasonal influenza

                                  viruses circulate and cause seasonal epidemic

                                  Fact sheet

                                  Publications

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                                  Coadministration of seasonal inactivated influenza and COVID-19 vaccines

                                  Vaccination programmes against COVID-19 and seasonal influenza are currently being implemented in parallel in many countries. Administration of both vaccines...

                                  The Pandemic Influenza Pandemic (PIP) Framework's Partnership Contribution (PC) High-Level Implementation Plan II (HLIP II) outlines the strategy...

                                  Spotlight

                                  Influenza: are we ready?

                                  WHO Spotlight

                                  Influenza may not always be thought of by most people as a serious illness – the symptoms of headaches, runny nose, cough and muscle pain can make people confuse it with a heavy cold. Yet seasonal influenza kills up to 650 000 people every year. That is why influenza vaccinations are so important, especially to protect young children, older people, pregnant women, or people who have vulnerable immune systems.