But diapers aren't meant to safeguard against vapours or other elements in tear gas, so neither will a surgical mask. The N95 or X301 do not protect the wearer from pollution. Yu says the respirators block containments in particle form only, not gases like ozone and nitrogen dioxide.
Flu vaccine is an inactivated vaccine, meaning that it contains killed influenza virus. The killed influenza virus is injected into muscles or skin and stimulates the immune system to produce an immune response (antibodies) to the influenza virus.
This means that although a very tiny amount of the influenza virus is injected into your body, it is dead and cannot replicate to make you sick. However, the nasal flu vaccine (FluMist) is different. It is a live attenuated influenza vaccine (LAIV), meaning it is made from a weakened live flu virus.