Explained: What is the purpose of injecting Covid vaccines into the upper arm?
Almost everyone who has been vaccinated for Covid-19 in the last 16 months recalls a rapid prick in the upper arm. This is because most vaccinations, including those for Covid-19, are most effective when delivered intramuscularly into the deltoid muscle in the upper arm, according to specialists. Why are vaccines usually given muscle? There are various reasons for this, but the most essential is that muscles have a well-developed blood supply system. When a vaccination containing an antigen is injected into the muscle, the antigen is released, and the antigen is disseminated via the muscular vasculature, which is the arrangement of blood vessels in the muscle. The antigen is subsequently picked up by dendritic cells, a type of immune cell that functions by displaying antigens on its surface to other immune system cells. The antigen is carried to the lymph node by dendritic cells through the lymphatic fluid. "Through years of research, we've learned that lymph no...