It's Time For A Flu Shot. Here's What You Need To Know

There's another shot doctors are advising you get this winter — the flu vaccine. We tackle questions about this flu season and why the vaccine is important as people head back into workplaces and kids return to school.

By Fran Kritz

September 07, 2021

Updated July 03, 2023

With all the talk about COVID-19 vaccines and boosters, it's easy to forget that there's another respiratory virus poised to strike.

Yes, it's that familiar winter nemesis, the flu. And there are vaccines to help ward it off — but also misinformation and fears circulating. "We've been concerned about vaccine fatigue and that people will be confused about whether or when they need the flu shot, and not very eager to once again roll up their sleeve," says Dr. William Schaffner, medical director of the National Foundation of Infectious Diseases. "Flu is a nasty virus and worth protecting against."

"Two reasons make getting vaccinated against the flu the wise choice," he says. "First, it's been proven year after year that you're in better shape to fight off the flu if you get the vaccine. Second, by getting vaccinated against the flu, you help protect the people around you."

Here's a guide to getting yourself vaccinated against another potentially fatal virus.

I heard the flu essentially disappeared last year. Do I really need a flu shot this year?

Yes. Last year saw a record-low number of flu cases, likely thanks to widespread mask wearing, remote work and school, and physical distancing. But this year, experts fear that the reopening of schools, decreased adherence to pandemic precautions and surging delta variant infections could create a double whammy: a very serious flu and COVID-19-season. Already, cases of RSV, a serious respiratory virus in children, are spiking. "This suggests that flu will be back [too]," says LJ Tan, executive director of the Immunization Action Coalition.

Who should get a flu shot?

Anyone six months and older, unless your doctor has specifically recommended that you not get a flu shot because of a prior, rare, severe reaction, says Dr. Lisa Grohskopf, a medical officer in the influenza division at the Centers for Disease Control and Prevention.

When's the best time to get the flu shot?

Why not now?

Flu season starts in October in the U.S. While there's some concern that immunity might wane before the end of flu season in May if you get the vaccine too early, there's not enough data to know the optimal time to get the shot, Grohskopf says.

The CDC says aim to get your flu vaccine by the end of October. By then, cases will have started to mount, and many people will be just a few weeks away from travel for Thanksgiving and Christmas. That said, "getting vaccinated at any time during the flu season will still be beneficial," says Dr. Andrew Pavia, chief of pediatric infectious diseases at the University of Utah Health.

Will the flu vaccine definitely keep me from getting the flu?

No. No vaccine is 100 percent effective. But if you do get the flu, the vaccine is likely to reduce your chance of getting very sick, being hospitalized or dying, Pavia says. Before last year, tens of thousands of people got hospitalized or died from the flu each year, usually people who weren't vaccinated.

Can I get the flu and COVID-19 vaccines at the same time?

Absolutely. The CDC had previously recommended spacing out the timing of the COVID-19 vaccine and other immunizations because the vaccines were so new, but "that guidance has changed," says Grohskopf. The CDC now says it's safe to get both vaccines at once, she says. "The body's immune response and side effects are generally the same as when getting one vaccine alone." If you do get two shots on the same day, expect to get each vaccine in a different arm, which may reduce pain and swelling.

What about my COVID-19 booster shot — can I get that at the same time as my flu shot?

Right now, third doses of COVID-19 vaccine are authorized only for people with certain immunocompromised conditions. If you qualify, you can get that extra dose and the flu shot on the same day. Once boosters are more broadly authorized, "we'll be able to co-administer those shots with flu shots as well," said Lisa Kalajian, a district manager for CVS.

Q: The delta variant is making me anxious about going to the doctor's office or pharmacy for a flu shot this year. Are there other choices?

If you're concerned, aim for an off hour and call to make sure the provider (as well as you) will be masked. If you're still worried, check with local clinics to see if there are any outdoor flu shot clinics in your area.

How do I make sure I get the right flu shot for me and my family?

"While the most important thing is to get any flu shot, there are some specialized flu shots for specific groups," says Pavia. The key is usually age.

Kids 8 and younger who are getting the flu shot for the first time need two doses, given a month apart, says Dr. Flor Munoz-Rivas, a pediatric infectious disease specialist at Baylor College of Medicine. Strong immunity doesn't kick in until two weeks after the second shot, "so parents should be scheduling these shots now," she says.

Immune systems weaken with age. That's why the CDC recommends that adults 65 and older get vaccinated with one of two souped-up flu shots: either the Fluzone High-Dose Quadrivalent vaccine or the FLUAD Quadrivalent vaccine. Both are designed to elicit a more robust immune response. If neither is available, then any flu shot is a good choice.

I'm pregnant. Should I get a flu shot?

Yes. And if you're in your third trimester, the CDC advises you get a flu shot ASAP so you can pass on the protection to your newborn from day 1. "Babies can't get the flu shot until they are 6 months old but are protected by their mother's antibodies from a flu shot—if she gets the shot—until six months, when they can get their own flu vaccine," says Grohskopf. Just be sure to get the shot, not the nasal spray.

I have an allergy to eggs and heard I can't get a flu shot. Is that true?

Not really, says CDC's Grohskopf.

It's true that most flu shots and one nasal spray flu vaccine approved by the Food and Drug Administration are manufactured using egg-based technology, so they contain a small amount of egg proteins. But studies of both the nasal spray and the shots found that allergic reactions are very rare.

Two egg-free vaccines are available: Flublok Quadrivalent (for people 18 and older) and Flucelvax Quadrivalent (which is approved for age 2 and up this season). But the CDC says people with a history of egg allergy can get any licensed, age-appropriate flu vaccine. If you have a history of severe allergic reaction to eggs, the CDC recommends you get your shot at a location where staff can treat you if a rare allergic reaction does occur.

I'm willing to take my chances, so why should I get the flu vaccine?

With the pandemic still raging, skipping the flu shot is a much riskier proposition, says Dr. Bernard Camins, an infectious disease physician at the Mount Sinai Health System in New York City. "You could get the flu and need care but find hospitals overwhelmed because of COVID, or get the flu and get COVID. And especially if you are not vaccinated against the coronavirus, [you] run the risk of your immune system being overwhelmed by two viruses at the same time." Getting back-to-back infections could result in more serious illness, since the first infection will have already weakened your lungs, says Dr. Priya Nori, an infectious disease specialist at Albert Einstein College of Medicine.

If I'm already vaccinated against COVID-19, does getting the flu shot mean I'm doubly protected, and no longer have to wear a mask?

Not at all. "Don't stop the public health measures," says Pavia. Distancing, wearing a mask and washing your hands, especially after coughs and sneezes, can improve the chances that you and others will not get the flu — OR COVID-19.