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Some people are at high risk of serious complications as a result of influenza, some of which can be life-threatening and result in death. The risk groups includes people who are more likely than others to develop severe disease if they should be infected, such as the elderly, pregnant women, young children and people with underlying health conditions.

Influenza is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs. It can cause mild to severe illness, and at times can lead to death. The best way to prevent flu is by getting a flu vaccine each year.

Injected trivalent inactivated influenza vaccines are most commonly used throughout the world. Influenza antigen preparation varies between manufacturers. The inactivated influenza vaccines available in the EU/EEA may contain either split virion influenza virus products or subunit influenza products.