Can You Get the Flu Twice?

The flu, or influenza, is a highly contagious respiratory illness that spreads easily. When we think of getting sick, we frequently assume that means we’re protected from another bout of the same illness in the near future. Unfortunately, that’s not always the case, especially with the flu. Let’s delve into the reasons why the flu can sidestep our defenses and strike twice.

The Nature of the Flu Virus

Influenza viruses are masters of change and adaptation. The reason we need an annual flu shot is that it targets the dominant strains predicted for that season. But here’s the catch:

  • Multiple Strains: Flu viruses mainly come in two types: Influenza A and Influenza B. Within each type are various subtypes – think of them as the virus’s many disguises.
  • Constant Mutation: Viruses are always trying to outsmart our immune systems by subtly changing their structure. Getting the flu once might protect you from that specific strain, but your body could still be vulnerable to the others floating around

What Happens When You Get the Flu

When you get the flu, your immune system jumps into action, creating antibodies to fight the virus. These antibodies help provide immunity against that particular strain. The keyword here is strain. If you were exposed to a similar strain recently, the antibodies built up should recognize and fight it off effectively. However, it’s often a different story when a new strain is circulating.

Can You Get the Flu Twice in One Season?

Unfortunately, yes. Due to the different flu strains and constant mutations, there is a risk of getting the flu twice in a single season. While your antibodies can combat the strain you just recovered from, you may still get sick from a different one if you’re exposed to it.

Reinfection vs. Relapse

Sometimes, you think you’ve conquered the flu only to see a return of symptoms days or weeks later. There are two ways this can happen:

  • Relapse: The original flu virus wasn’t entirely defeated, and it regains strength leading to another round of symptoms. This is more likely in people with weakened immune systems.
  • Reinfection: You become infected with a completely different strain of the flu virus before you’ve completely recovered.


While battling the flu multiple times is possible, you can take steps to limit your risk:

  • The Flu Shot: The single best step in flu prevention. Consider it even if you already had the flu that season. It may decrease the chance of becoming ill again or help limit symptom severity.
  • Hygiene: Good old-fashioned hand washing and avoiding sick people remain your allies. Clean and disinfect surfaces, especially during flu season.
  • Immune Health: Support your immune system with nutritious foods, rest, and stress management. A healthy body is better equipped to fight off the flu.


1. If I got a flu shot, can I still get the flu twice?

While the flu shot is the best protection, it is not a guarantee. The vaccine does reduce the overall risk of contracting the flu, and can reduce symptom severity. However, there are still opportunities for infection to occur:

  • The vaccine targets the viruses deemed most likely to circulate, but sometimes other strains become dominant.
  • It takes about two weeks to build strong immunity after the shot. If you’re exposed immediately before or during that window, you may still get sick.

2. How common is it to get the flu twice in one season?

While it’s possible, it’s not the most common scenario. Most people, given sufficient recovery time, develop a level of immunity against multiple strains after an initial infection. This isn’t always foolproof, however. With constantly shifting strains, even the healthy can see double trouble from the flu virus some years.

3. What should I do if I think I’ve contracted the flu again?

Seek medical advice. Don’t delay diagnosis if you suspect you have the flu. Even if you recently had it, a doctor can identify the type of virus and help advise on appropriate treatment. They can also confirm whether your recurrence is a relapse or a new infection.


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