Explained: Why are Covid-19 vaccines administered into the upper arm? - The Indian Express

Most vaccines, including Covid-19, are most effective when administered through the intramuscular route into the upper arm muscle. But why the upper arm muscle in particular?

Almost everyone vaccinated for Covid-19 over the last 16 months will remember that he or she received a quick prick in the upper arm. This is because most vaccines, including those for Covid-19, are … [+4854 chars]

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