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.
Influenza (flu) vaccines are nasal sprays or injections currently composed either of live flu viruses that have been attenuated (rendered much less able to cause infection) or killed viruses or virus components (both are unable to reproduce) that, when administered to individuals, generate an immune response that will be strong enough to protect that individual from developing influenza disease.