FluMist is the only nasal vaccine approved in the U.S. It’s administered as two spritzes—one in each nostril—and stimulates antibodies against the influenza virus in the nasal passages and bloodstream to protect against serious disease.

AstraZeneca’s FluMist Home program officially launches today, sending nasal flu vaccines straight to people’s homes. FluMist is a flu vaccine that’s sprayed up your nose. It’s been FDA-approved since 2003, and studies show it works about as well as the traditional flu shot at preventing infections and reducing the risk of serious illness.