The influenza vaccine is a vaccine designed to stimulate immunity against influenza viruses and reduce the risk of influenza and its complications.
Influenza vaccines are formulated to provide protection against influenza viruses expected to circulate during a particular season. Because influenza viruses continually undergo genetic changes, vaccine composition is reviewed and updated periodically.
Vaccination can reduce the likelihood of influenza and can also reduce the risk of severe illness and complications when infection occurs. Different formulations may be appropriate for different age groups and circumstances.
QUICK FACT
The influenza vaccine cannot cause influenza infection. Influenza vaccines use formulations that do not cause the disease in the way an infection with a circulating influenza virus does.
COMMONLY CONFUSED WITH
Antiviral: An influenza vaccine is used primarily to prevent influenza by stimulating immunity, whereas an antiviral is a medicine that acts against the virus and may be used for treatment or prevention in appropriate circumstances.
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