Why Do We Need Flu Shots Every Year?

Why Do We Need Flu Shots Every Year?

The flu, or influenza, is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to death. Every year, millions of people get sick from the flu, and thousands die from flu-related complications. So why do we need flu shots every year? Why can't we just get one shot and be protected forever?

The answer lies in the nature of flu viruses. They are constantly changing and evolving. This is why the flu shot is updated every year to match the most prevalent strains circulating in the population. Imagine the flu virus as a chameleon, constantly changing its appearance to evade our immune system.

How Flu Viruses Change

Flu viruses have two main proteins on their surface: hemagglutinin (H) and neuraminidase (N). These proteins help the virus attach to and enter human cells. There are many different subtypes of these proteins, and the flu virus can change its H and N subtypes through a process called antigenic drift. This means that the virus gradually accumulates small mutations in its genetic code, making it slightly different from previous strains.

Imagine a flu virus with a specific combination of H and N proteins like H1N1. Over time, through antigenic drift, the H1N1 virus can mutate into H1N2 or H3N1. These mutations may not be significant enough to create a completely new virus, but they can make the virus less recognizable to our immune system. This means that a flu shot developed for the previous year's H1N1 strain might not be effective against the newly mutated strain.

Why Flu Shots Are Not a One-Time Solution

Because flu viruses are constantly evolving, a single flu shot does not provide lifelong immunity. Our immune system needs to be regularly exposed to the latest strains of the virus to develop strong protection. This is why the flu shot is recommended annually. It helps to keep our bodies up-to-date with the latest flu strains and offers the best protection against getting sick.

Who Should Get a Flu Shot?

The Centers for Disease Control and Prevention (CDC) recommends that everyone six months of age and older get a flu shot every year. This is especially important for people who are at high risk for flu complications, such as:

• Young children
• Pregnant women
• Older adults
• People with chronic health conditions
• People with weakened immune systems

Benefits of Getting a Flu Shot

Getting a flu shot can significantly reduce your risk of getting sick from the flu. Even if you do get sick, the flu shot can help to lessen the severity of your illness. In addition, getting a flu shot can help to protect those around you, especially those who are at high risk for flu complications.

It's important to note that flu shots are not 100% effective. However, they are the best way to protect yourself and others from the flu.

Remember, getting a flu shot is a simple and effective way to protect yourself and your loved ones from the flu. Don't wait, get your flu shot today!