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.
In the case of a pandemic, an additional vaccine may be created to protect against a particularly virulent or widespread strain of influenza. The need for a 2009 H1N1 influenza vaccine became apparent after the strains for the seasonal flu vaccine had already been selected, so that a separate vaccine was created. A quadrivalent inactivated influenza vaccine was licensed in the United States in 2012, and a quadrivalent live virus nasal spray vaccine was licensed in 2013. These formulations include two influenza B strains in addition to the A strains. This vaccines began to be available, along with trivalent vaccines, in the 2013-14 influenza season.