News | Published February 7, 2012 | Written by Craig Collison, MD, pediatrics, Mount Nittany Physician Group

How Late Is Too Late To Get a Flu Shot?

Every year is unique when it comes to influenza - both the strains that are circulating and the timing of its arrival in a geographic area vary tremendously year-to-year. The Centers of Disease Control and Prevention (CDC) continually conduct studies to determine the amount of influenza in all areas of the country, and publish this information on a weekly basis. If you are interested in seeing the map documenting the spread of influenza, you can find it at

The flu shot vaccine for a particular year is typically available in late August or September. You can receive your flu shot once it is available until well into the flu season, which usually occurs between February and March in Central Pennsylvania. In looking at the most current map issued by the CDC, Pennsylvania is listed as "sporadic." This means that there has not been a consistent flu outbreak in the state but that a few cases have been reported.

The ideal time to get a flu vaccine is at least two weeks before exposure to the virus. This gives the body enough time to respond to the vaccine and have its antibody defenses at peak readiness. To prepare for the winter of 2012 in Central Pennsylvania, now is the best time to get that flu shot, because the prevalence of the flu is expected to increase over the next few months. Once the influenza illnesses begin to wane, it is no longer as useful to get a flu shot, and it is probably smarter to wait until the next season.

Recommendation: Get your flu shot before mid-February 2012 to give your body time to respond and prepare antibodies for the influenza virus. You can get a flu shot at a number of places, including your primary physician, health clinics and pharmacies.


About the Author

Craig Collison, MD, pediatrics, Mount Nittany Physician Group

Craig H. Collison, MD, is a pediatrician with Mount Nittany Physician Group. He treats patients from the Physician Group's Boalsburg and Bellefonte locations. Read more about pediatric care at

Articles by Collison

  • Dealing with separation anxiety

    Separation anxiety occurs when a child becomes emotionally upset when a parent or caregiver leaves for a period of time, whether it’s minutes...

  • Stress: Helping kids cope

    As an adult, we can face a long list of stressors on a daily basis: work, relationships, kids, money, and more. Sometimes we may wish for the stres...

  • Dangers of sunburn art

    It never fails to amaze me the different trends that teens and young adults create, especially when these trends are hazardous to their health. Rec...

  • Preventing summer learning loss

    Now that the school year is over, many kids look forward to sleeping in, playing with friends, and nights free of homework. With all the work and a...

See All Articles