Too Late for a Flu Shot?

Too Late for a Flu Shot?

Although the flu season lasts from October until May, with most cases occurring between late December and early March, the flu vaccine is usually offered between September and mid-November. Getting the shot before the flu season is in full force gives the body a chance to build up immunity to, or protection from, the virus.

Even though it's ideal to get vaccinated early, the flu shot can still be helpful later. Even as late as January, there are still a few months left in the flu season, so it's still a good idea to get protected.

Who Should Get the Flu Shot?

Although flu vaccine is recommended for everyone aged 6 months or older, in times when the vaccine is in short supply, certain people need it more than others. The Centers for Disease Control and Prevention (CDC) often will recommend that certain high-risk groups be given priority when flu shot supplies are limited. Call your doctor or local public health department about vaccine availability in your area.

The American Academy of Family Physicians (AAFP), the American Academy of Pediatrics (AAP), and the CDC recommend that certain high-risk groups be given priority for receiving the flu shot in times of shortage:

Ideally, kids and adults should be immunized in October so they're adequately protected before flu season hits.

Kids under 9 years old who are getting the flu shot for the first time will receive two separate shots at least a month apart. Those under 9 who have received the flu vaccine before still might need two doses if they did not receive at least two vaccines since July 2010, or if the number of shots they've received since July 2010 is unknown. This is to ensure that all children are vaccinated against the H1N1 flu strain that surfaced in 2009. Kids older than 9 years old only need one dose of the vaccine.

It can take 1 to 2 weeks for the flu shot to become effective, so it's best to get vaccinated as soon as possible if your doctor thinks it's necessary.

Those Who Should Not Get a Flu Shot

Certain circumstances might prevent a person from getting the flu shot. If your child falls into any of the groups below, talk to your doctor to see if a flu shot is recommended:

In the past, it was recommended that anyone with an egg allergy talk to a doctor about whether receiving the flu vaccine was safe because it is grown inside eggs. But health experts now say that the amount of egg allergen in the vaccine is so tiny that it (but not the nasal mist) is safe even for kids with a severe egg allergy. This is especially important during a severe flu season, such as the current one, which started earlier and has been much worse than in years past.

Still, a child with an egg allergy should get the flu shot in a doctor's office, not at a supermarket, drugstore, or other venue. And if the allergy is severe, it might need to be given in an allergist's office.

If your child is sick and has a fever, talk to your doctor about rescheduling the flu shot.

A non-shot option, the nasal mist vaccine, is now available, but because it contains weakened live flu viruses it is not for people with weakened immune systems or certain health conditions. The nasal mist vaccine is only for healthy, non-pregnant people between 2 and 49 years of age. Check with your doctor to see if your child can — or should — get this type of flu vaccine.

Are There Side Effects?

Most people do not experience any side effects from the flu shot. Some have soreness or swelling at the site of the shot or mild side effects, such as headache or low-grade fever.

Some people who get the nasal spray vaccine also may develop mild flu-like symptoms, including runny nose, headache, vomiting, muscle aches, and fever.

Where Can My Family Get Flu Shots?

Flu shots are available at:

If you have an HMO insurance plan, be sure to check with your primary care doctor before having your kids vaccinated outside the office, since most HMOs will pay for shots only if they're given through their plan.

Flu shots are covered by Medicare for senior citizens and are generally covered by insurance for people in other high-risk groups. Otherwise, flu shots may cost anywhere from $10 to $50. If you opt for the nasal mist flu vaccine, check to see if your insurance plan covers it.

Reviewed by: Elana Pearl Ben-Joseph, MD
Date reviewed: September 2013





Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

© 1995-2014 The Nemours Foundation/KidsHealth. All rights reserved.





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Related Resources
OrganizationCenters for Disease Control and Prevention (CDC) The mission of the CDC is to promote health and quality of life by preventing and controlling disease, injury, and disability. Call: (800) CDC-INFO
OrganizationAmerican Academy of Pediatrics (AAP) The AAP is committed to the health and well-being of infants, adolescents, and young adults. The website offers news articles and tips on health for families.
OrganizationImmunization Action Coalition This organization is a source of childhood, adolescent, and adult immunization information as well as hepatitis B educational materials.
Web SiteCDC Immunization: Pre-teens and Adolescents CDC site provides materials in English and Spanish for parents, teens, pre-teens, and health care providers about vaccines and the diseases they prevent.
Web SiteInfluenza Website of the Centers for Disease Control and Prevention (CDC) The CDC's site has up-to-date information on flu outbreaks, immunizations, symptoms, prevention, and more.
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