It has been observed that using a needle that is too short may inadvertently lead to subcutaneous administration of the vaccine ( Figure 1 ), resulting in reduced vaccine efficacy, seropositivity, and antibody titers compared to an intramuscular injection (3)
General Subcutaneous Injection Process Clean the injection area with an alcohol swab and allow to dry completely Draw the appropriate dose into an insulin syringe (29-31 gauge, 0.5 inch needle) Pinch a fold of skin and subcutaneous tissue between thumb and forefinger Insert the needle at a 45-degree angle into the pinched skin fold Release the skin fold and inject slowly over 5-10 seconds Withdraw needle and apply gentle pressure with a cotton ball if needed Do not rub or massage the injection site Wrist-Specific Injection Sites Local injection near the injury delivers higher peptide concentrations to target tissue compared to distant systemic injection
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