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Flu Vaccines for Adults 

The flu (influenza) is caused by a virus that is easily spread. A flu vaccine is your best chance to avoid the flu. The vaccine is given in the form of a shot (injection). It’s best to get vaccinated each year, as soon as the flu vaccine is available in your area. This can be done at your healthcare provider’s office or a health clinic. Pharmacies, senior centers, and workplaces often offer flu vaccines, too. If you want to know when the vaccine is available or if you have questions about getting vaccinated, ask your healthcare provider.

Health care provider giving woman injection in upper arm.

Flu facts

  • The flu shot will not give you the flu.

  • The flu is caused by a virus. It can’t be treated with antibiotics.

  • Influenza is not the same as stomach flu, the 24-hour virus that causes vomiting and diarrhea. Stomach flu is most likely due to a GI (gastrointestinal) infection, not the flu.

  • You need to get a flu shot each year.

Flu symptoms

Flu symptoms tend to come on quickly. Fever, headache, tiredness, cough, sore throat, runny nose, and muscle aches are symptoms of the flu. Children may have upset stomach or vomiting, but adults usually don’t. Some symptoms such as tiredness and cough can last for many weeks.

How a flu vaccine protects you

There are many types (strains) of flu viruses. Medical experts predict which strains are most likely to make people sick each year. This varies from year to year. Flu vaccines are made from these strains. With the shot, inactivated flu viruses are injected into your body. The viruses have been killed and can’t make you sick. But the vaccine does cause the body to make antibodies to fight these flu strains. If you are exposed to the same strains later in the flu season, the antibodies will fight off the virus. Older adults don't make these antibodies as well as younger people do. So a special high-strength flu vaccine is given to those older than 65. Your healthcare provider can tell you which type of flu vaccine is right for you.

Who should get the flu vaccine?

The CDC recommends that infants over the age of 6 months and all children and adults should get a flu shot every year.

Some people are at an increased risk of developing serious complications from the flu. It is extremely important that these people get the vaccine. They include those with:

  • Long-term heart and lung conditions

  • Other serious health conditions

    • Endocrine disorders such as diabetes

    • Kidney or liver disorders

    • Weakened immune system from disease or medical treatment. For example, people with HIV or AIDS, or those taking long-term steroids or medicines to treat cancer.

    • Blood disorders such as sickle cell disease

It is also very important that others who have an increased risk of being exposed to the flu or are around people with increased risk for complications get the vaccine. This includes:

  • Healthcare providers and other staff who provide care in hospitals, nursing homes, home health, and other facilities

  • Household members, including children of people in high-risk groups

Types of flu vaccines

The flu vaccine is available as a regular and a high-strength shot. Your healthcare provider will recommend the vaccine that is best for you.

Flu shot

The shot is available in a few different forms. There is a high-dose vaccine for those over 65 and a vaccine for those with egg allergies. It is safe for most people. Talk with your provider if you have had:

  • A severe allergic reaction to a previous flu vaccine

  • Guillain-Barré syndrome. This is a severe paralyzing condition.

Nasal spray

The nasal spray is also available but it is not recommended for the 2016-2017 flu season. The CDC says this is because the nasal spray did not seem to protect against the flu over the last several flu seasons. In the past, it was meant for people ages 2 to 49.

Online Medical Reviewer: Holloway, Beth Greenblatt, RN, M.Ed.
Online Medical Reviewer: Lentnek, Arnold, MD
Last Review Date: 12/1/2016
© 2000-2016 The StayWell Company, LLC. 780 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.