Tetanus shots,flu shots,and most inoculations are administered by intramuscular injections.

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Tetanus shots, flu shots, and many other inoculations are typically given as intramuscular injections, which means they are injected directly into a muscle, usually the deltoid muscle in the upper arm or the gluteus maximus in the buttocks. This is because intramuscular injections allow for more rapid absorption of the vaccine and provide longer-lasting immunity than other routes of administration.

Tetanus Shots,flu Shots,and Most Inoculations Are Administered by Intramuscular Injections