Inadequate deltoid muscle penetration and concerns of improper COVID mRNA vaccine administration can be avoided by injection technique modification.

Current practice guidelines recommend using a needle 25 mm in length, to ensure a 5 mm penetration of the tip into the deltoid muscle, so a difference of more than 8 mm in women and 12 mm in men, or a total of 20 mm or larger difference between the flat injection technique and the SB technique could be considered significant.

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If only 10 percent are mis-injected, many millions might incorrectly be assumed to be immune, with possibly significant personal and societal consequences.

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