Everything You Need to Know About the Flu and Its Vaccination

This comprehensive guide explores influenza, its risks, and the best strategies for prevention through vaccination. It covers the types of flu vaccines available, their components, administration guidelines, and potential side effects. Emphasizing the importance of annual vaccination, especially before flu season, this article provides essential information for individuals aged 3 and above to protect themselves and reduce complications from the flu.

Overview of Influenza and Preventive Measures

Influenza, often called the flu, is a highly contagious viral infection that affects the respiratory tract. Since antibiotics are ineffective against viruses, treatment focuses on alleviating symptoms like fever and body aches through medications, rest, and hydration. Antiviral medications can cut short the illness if taken within the first two days. Proper care reduces the chances of serious complications such as pneumonia. Annual flu vaccination remains the most effective preventive strategy.

The key flu vaccine is known as the Quadrivalent inactivated influenza vaccine, marketed as Fluarix Tetra.

This vaccine includes antigens for four flu virus strains:

A/Michigan/45/2015 (H1N1)pdm09-like virus

A/Hong Kong/4801/2014 (H3N2)-like virus

B/Brisbane/60/2008-like virus

B/Phuket/3073/2013-like virus

Each 0.5 ml dose contains 15 micrograms of hemagglutinin from each strain, aimed at preventing infections caused by these four viruses.

The vaccine stimulates the immune system to produce antibodies against the hemagglutinin proteins on the viral surface. These antibodies then neutralize the viruses, providing immunity. It is recommended to get vaccinated annually, ideally before the flu season starts in October. Suitable for individuals aged 3 and above, with additional doses for unvaccinated children between 3 and 9 years old.

Review patient medical histories, especially previous vaccinations and allergies.

Have medical support available for emergency allergic reactions.

Postpone vaccination if experiencing high fever.

Administer the vaccine via intramuscular injection, avoiding intravenous or subcutaneous routes.

Pregnant women should only be vaccinated when clearly necessary, weighing potential benefits and risks.

Common side effects include soreness at the injection site, fatigue, muscle pains, and slight fever. Rare reactions may involve dizziness, rash, or swelling. The vaccine is administered via intramuscular injection into the deltoid or thigh muscles to ensure safety and effectiveness, avoiding intravenous methods to prevent severe allergic responses.