22/05/2021 04:09 PM | Click to read full article
Millions have rolled up their sleeves for the Covid-19 vaccine, but why haven’t they rolled up their pants legs instead? Why do we get most shots in our arms?
Arm muscles make an excellent vaccine administration site because muscle tissue contains important immune cells. These immune cells recognize the antigen, a tiny piece of a virus or bacteria introduced by the vaccine that stimulates an immune response.