Influenza A

Influenza A virus (IAV) is a pathogen that causes the flu in birds and some mammals, including humans.[1] It is an RNA virus whose subtypes have been isolated from wild birds. Occasionally, it is transmitted from wild to domestic birds, and this may cause severe disease, outbreaks, or human influenza pandemics... A filtered and purified influenza A vaccine for humans has been developed and many countries have stockpiled it to allow a quick administration to the population in the event of an avian influenza pandemic. In 2011, researchers reported the discovery of an antibody effective against all types of the influenza A virus... The annually updated, trivalent flu vaccine consists of hemagglutinin (HA) surface glycoprotein components from influenza H3N2, H1N1, and B influenza viruses. https://en.wikipedia.org/wiki/Influenza_A_virus