Getting vaccinated can lower your chances of getting the flu. While you can get a flu shot anytime during flu season, the timing does matter.
According to the
In this article, we’ll help you understand how to time your flu vaccine for maximum protection.
In the northern hemisphere, the
The flu virus is around all year, but it spreads more easily from September through the spring, generally peaking between December and February.
It takes about 2 weeks to develop enough antibodies from the flu vaccine to protect you against the flu.
Protection fades over time, so getting vaccinated before September may leave you more vulnerable toward the end of flu season.
You can continue to get the vaccine through late winter to early spring.
Children ages 6 months to 8 years may need 2 doses 4 weeks apart if they have not received at least 2 doses in prior years or do not know if they received this previously. Otherwise, they should be able to have an annual dose, so it’s best to get them started in early September.
Almost everyone ages 6 months or older can benefit from being vaccinated against the flu.
Some people are at an increased risk of serious flu complications, including those who are:
- younger than 2 or older than 65
- pregnant
- living in a long-term care facility
People with the following conditions may also be at a higher risk of flu complications:
- asthma
- cancer
- chronic lung disease
- diabetes or other endocrine disorder
- heart, kidney, or liver disease
- HIV or AIDS
- metabolic syndrome
- a neurological condition
- obesity
- sickle cell disease or other blood disorder
- suppressed immune system
The flu vaccine is safe for most pregnant people or those with a chronic health condition.
You can get a flu vaccine by injection or nasal spray.
If you’re currently feeling sick, it’s best to wait until you’re better.
Avoid the flu shot if you have a severe allergy to any of the ingredients that may be used in the vaccine, such as:
- thimerosal, a preservative
- monosodium glutamate (MSG), a stabilizer that keeps vaccines from losing their potency
- antibiotics, such as neomycin and gentamicin
- polysorbate 80, an emulsifier that keeps the ingredients from separating
- formaldehyde, which inactivates the flu virus
Babies under 6 months old shouldn’t be vaccinated.
If you’ve had Guillain-Barré syndrome, talk with your doctor before getting the flu vaccine.
The nasal spray contains a weakened live virus. It shouldn’t be taken by people who:
- are younger than 2 or older than 50 years
- are 2 to 4 years old and have asthma
- are 2 to 17 years old and take medications containing aspirin or salicylate
- are pregnant
- have life threatening allergies to the flu vaccine
- have a suppressed immune system
- are in close contact with someone with a suppressed immune system
- have taken antiviral drugs for the flu within the previous 48 hours
Talk with your doctor about the pros and cons of the nasal spray vaccine if you have:
- asthma or chronic lung disease
- a blood disorder
- diabetes or other metabolic disorders
- heart, kidney, or liver disease
- a neurologic or neuromuscular disorder
The flu shot prompts your immune system to produce antibodies against a specific strain of the flu. If you’re exposed to this particular flu virus later, you’ll already have antibodies ready to fight off the virus.
It usually takes about 2 weeks to build up your immunity to a flu virus after you’ve been vaccinated against it.
You’ll have the most antibodies
Each year’s vaccine is based on which strains are most likely to spread during that flu season.
The vaccine won’t protect you from every strain. But if you do get sick, it’ll likely be less severe due to the vaccine.
Getting your flu shot can help lower your risk of flu complications that could put you in the hospital.
Most people have little to no reaction following the vaccine. There’s no live virus in the flu shot, so it can’t give you the flu.
Some people have a temporary reaction at the injection site, such as:
- tenderness
- redness or other color changes
- minor swelling
This usually clears up within a day or two.
Other side effects may include:
- headache
- lightheadedness
- Low grade fever
- muscle aches
- nausea
These side effects are usually mild and should clear up in a couple of days.
Signs of severe allergic reactions usually occur within a few hours. These may include:
- fainting
- hives
- hoarseness
- rapid heartbeat
- swelling of eyes or lips
- trouble breathing
- wheezing
Usually, you can get a flu vaccine at your doctor’s office, your local pharmacy, or even at a walk-in retail clinic.
Some employers even provide flu shots for their employees at their workplace.
The flu shot is often free in the United States if you have health insurance. If you’re not sure whether it’s covered, call your insurance provider to find out if you need to pay anything toward the cost.
Even without insurance, you should be able to find a flu vaccine for under $50.
It’s a free preventive service under Medicare and Affordable Care Act (ACA) compliant policies.
If you don’t have health insurance or can’t afford a vaccine, you may still be able to find a low cost or no-cost flu vaccine. To learn more about these options, try the following:
- Call your doctor’s office, local hospital, and local community clinics.
- Call local pharmacies, and be sure to ask about coupons.
- Contact your
state health department . - Visit Vaccines.gov, a searchable database of local vaccine providers.
The flu can strike anyone and lead to serious, life threatening complications.
The best time to get your flu shot is from early September to late October. This timing offers you and your loved ones maximum protection for the duration of the flu season.
The vaccine is safe for most people. If you are allergic to substances that may be used in a vaccine, talk with your doctor or pharmacist about your concerns.