Flu Shot

A flu shot, medically known as an influenza vaccine, is an immunization administered to protect individuals against the influenza viruses that research suggests will be most common during the upcoming flu season. Composed of killed (inactivated) or weakened (attenuated) flu virus strains, the vaccine stimulates the recipient's immune system to develop antibodies, typically within two weeks after vaccination. These antibodies provide defense against the virus, reducing the likelihood of contracting the flu and its associated complications. Vaccination is recommended annually due to the ever-evolving nature of influenza viruses and the waning of post-vaccination immunity over time.

Flu shots come in various forms, including trivalent (three-component) or quadrivalent (four-component) vaccines that cover different virus strains. The trivalent vaccine typically includes two A-strains and one B-strain of the virus, while the quadrivalent includes an additional B-strain for broader protection. Recommended for nearly all individuals over six months of age, particularly high-risk groups such as the elderly, pregnant women, and those with chronic health conditions, flu shots are a key preventive measure in public health efforts to minimize the impact of seasonal influenza outbreaks.