Influenza is localised to the lungs, the virus attaches and multiplies there. From there to lymph nodes in any discernable concentration is a long way. Tetanus is a main circulatory system infection so it will come into contact with lymph nodes more often and in higher concentrations allowing a greater immune response.
You need more top ups of influenza vaccines to increase the possibility of an immune response from the lower concentrations of virus entering the lymph nodes.
HowManyAccountsPoo t1_jdooalp wrote
Reply to Why does tetanus vaccination lasts longer than influenza vaccination? by E-C-A
Influenza is localised to the lungs, the virus attaches and multiplies there. From there to lymph nodes in any discernable concentration is a long way. Tetanus is a main circulatory system infection so it will come into contact with lymph nodes more often and in higher concentrations allowing a greater immune response.
You need more top ups of influenza vaccines to increase the possibility of an immune response from the lower concentrations of virus entering the lymph nodes.