Some vaccinations are only needed a couple of times to provide sufficient protection to a person. However, it is advised to get some vaccines more frequently, such as the yearly influenza vaccine. Irifer why a new influenza vaccine has to be developed, produced, and distributed on a yearly basis.
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Influenza has several different glycoproteins on the viral surface with different molecular structures.
Irifluenza is only subject to irinate immune responses, such as barrier defenses
Influenza mulates rapidly, and newer strains cannot be recognized by the adaptive immune system.
Influenza Impairs immune responses and leaves the body susceptible to infections that otherwise a healthy immune system could defeat.