Live, weakened vaccination delivered through the nose is one type of flu vaccine. This vaccine should not be given to children under the age of 2, women who are pregnant, or anyone who has compromised immune systems.
The other vaccine is the one produced by dead germs. This vaccine can be given to everyone.
Four distinct influenza virus strains are present in each dose of the vaccination. Due to the influenza viruses recurring structural changes, the vaccine’s ingredients may vary twice per year.