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SWithnell t1_j50wqwa wrote on January 19, 2023 at 5:05 PM

Reply to comment by IosaTheInvincible in Is there any difference in efficacy when a vaccine is administered somewhere other than the upper arm (e.g. on the foot)? by MercurioLeCher

It's about how the vaccine is taken up by the body. IM is a much slower release than IV which minimises reactions, especially anaphylactic shock and more serious side effects.