Originally Posted by Perderabo

The injected vaccine is a shard of a virus and cannot cause the flu. But the inhaled vaccine is live virus and can cause the flu. Folks my age need to avoid the inhaled vaccine.

The nasal spray flu vaccine (sometimes called LAIV for Live Attenuated Influenza Vaccine) is a vaccine made with live, weakened viruses that cannot grow at normal body temperature and is given via a nasal sprayer. This vaccine was approved for seasonal influenza viruses in 2003 and tens of millions of doses of the vaccine have been given in the United States.