What You Need to Know About the Flu Vaccine This Flu Season

Flu may seem like a common disease, but it can sometimes be serious, contagious, and life-threatening. Influenza is so much more than that. Depending on your circumstances, you could get a high fever, profound body aches, serious fatigue, and so on. 

It may not be a problem for young and healthy people, but the situation can be complex for young children and older adults. The worst thing about the flu is how quickly the illness evolves. It should not be taken lightly.

Luckily, there are many ways to protect people from the flu these days. The seasonal flu vaccine may be innocuous but it saves many lives every year. If you are curious how the seasonal flu vaccine works, here is some vital information you should know:

How Does Flu Vaccine Work? 

Similar to other vaccines, the flu vaccine works by triggering a person’s immune response and creating a defense against disease-causing pathogens. When a person develops antibodies against a particular disease, these antibodies can fight against and provide protection from the virus. 

As mentioned earlier, different kinds of flu become contagious depending on the season. 

Researchers predict what flu virus would be more active during a particular period and produce the specific vaccine to defend against it.

In the US, there is a vaccine that fights four kinds of flu viruses (quadrivalent). This flu vaccine is meant to fight the following viruses:

  • The Influenza A (H1N1) virus
  • The Influenza A (H3N2) virus
  • Two Influenza B viruses

Another one can fight three different flu viruses, called the trivalent. It can kill the following viruses: 

  • The Influenza A (H1N1) virus
  • The Influenza A (H3N2) virus
  • One of the two Influenza B viruses

Persons aged six months and older are encouraged to get a flu vaccine every year. Keep in mind, however, that the antibodies work after two weeks, so schedule your flu shot before the flu season—ideally, by the end of October.

The Types of Flu Vaccines You Would Encounter

Here are some essential things you need to know about the available vaccines:

The Trivalent Flu Shot

This flu vaccine is made from three ingredients approved for people aged 65 and above. It also comes with an adjuvant, an element that helps the body build a more robust immune response.

The Quadrivalent Flu Shot

This flu shot is made from four ingredients, and it can be used for people of different age groups, particularly those six months and older. Here are some common ones you might encounter: 

  • FluMist Quadrivalent: Good for people aged two to 49 years old; not ideal for pregnant people, immunocompromised persons, and the like
  • Flucelvax Quadrivalent: Recommended for people four years old and above
  • Flublok Quadrivalent: Approved for people 18 years and older
  • Quadrivalent Flu Shot Using an Adjuvant: Best for people aged 65 years and older
  • Fluzone High-Dose: Also recommended for people aged 65 years and older


Both the trivalent and the quadrivalent influenza vaccines are generally available in clinics and hospitals. Before choosing one, make sure that the vaccine you would receive is appropriate for your age and health. The vaccines should also be labeled suitable for a particular period. For example, in today’s time, the products you would encounter are the influenza vaccine products for the 2020 to 2021 season. 

Get your flu shots every year from a trusted clinic. Aspen Medical Center is a provider of state-of-the-art urgent care and primary care in Sta. Fe. We offer immunization services as one of our essential primary care services. If you need one, call us today at 505-466-5885 to book an appointment.