Q&A: Flu Shots

A glass vial of flu shot vaccine sitting on a red countertopQ:
My 9-year-old daughter has asthma. She had her flu shot late in the season in April 2009. Should I take her to get another one now or is there a time period to wait since she has already received one in 2009?

A: Flu viruses change from year to year. You can get influenza more than once during your lifetime. The immunity that is built up from having influenza caused by one virus strain doesn’t always provide protection when a new strain is circulating. Also, a vaccine made against influenza viruses that circulated last year may not protect you against the newer viruses. That is why the influenza vaccine is updated to include current viruses every year. I would recommend that you get your child immunized with the current season’s influenza vaccine.