Definition: The word "influenza vaccine" refers to a series of vaccines that are used to prevent influenza, which is a common respiratory illness caused by influenza viruses. These vaccines typically target two types of influenza viruses - H1N1 and H3N2 - and are administered as part of an overall plan to prevent the spread of these viruses. There are different types of influenza vaccine available depending on the age group, severity of the infection, and other factors such as allergies or immunocompromised status. The most commonly used vaccines include quadrivalent (three doses), which contains three doses of two different strains of influenza A viruses - H3N2, H1N1, and H5N1. The influenza vaccine is typically administered as a single shot, with the first dose usually given 7-10 days after becoming sick. The second dose may be given four weeks later if you have a history of influenza or are at high risk for getting influenza. Influenza vaccines can help prevent the spread of influenza and reduce the severity of illness by stimulating your immune system to produce antibodies against the virus. They also protect against future infections, as they provide protection against a specific strain of influenza that may be resistant to common strains of influenza viruses.

Influenza Vaccine (Quadrivalent)