The nasal spray vaccine contains a “live attenuated” flu virus, but the virus is weakened so that it cannot cause the flu. A 2013 survey conducted by the national foundation for infectious diseases revealed that 41 percent of people think the flu is only contagious after symptoms start. May persist for several weeks. : a flu headache is usually severe and tends to spread over the forehead and behind the eyes.
What kinds of flu shots are there?
Sore throat after flu shot.
Read this next
What is time line. If they are allergic to eggs or gelatin.