Several influenza vaccines have been made in the form of a nasal spray, instead of an injection. The sprays confer two kinds of immunity to the recipient but can be difficult technologically to make. Tim Sloan/AFP via Getty Images hide caption
FluMist
Friday
Sunday
The microneedle patches developed at Georgia Institute of Technology's Laboratory for Drug Delivery each contain an array of needles less than a millimeter long. Courtesy of Georgia Institute of Technology hide caption
Thursday
Luz Barajas took her son Carlos Cholico to get his flu shot at Crawford Kids Clinic in Aurora, Colo., last year. Health officials say there is some evidence the flu shot is more protective than the nasal flu vaccine. Brent Lewis/The Denver Post via Getty Images hide caption
Tuesday
Fourth-grader Jasmine Johnson got a FluMist spray at her Annapolis, Md., elementary school in 2007. This year, the nasal spray vaccine isn't recommended. Susan Biddle/Washington Post/Getty Images hide caption
Monday
FluMist is a live attenuated vaccine, which should make it more effective than the inactivated virus in flu shots. Joe Raedle/Getty Images hide caption
Monday
Back in 2009, Ella Curry, 6, received a spritz of FluMist at Northwood High School in Silver Spring, Md. Jacquelyn Martin/AP hide caption