An intramuscular vaccination should be given?

• A. In the vein
• B. Under the skin
• C. In the muscle
• D. Into the brain

Answer: (C)

Intramuscular means delivering the vaccine directly into the muscle tissue. This route ensures the vaccine is absorbed steadily and stimulates a strong immune response. In cattle, the neck muscle is usually used for IM injections to avoid damaging valuable meat and to give the handler easy access. Other routes—into a vein, under the skin, or into the brain—are not IM and have different risks or absorption patterns; the brain is dangerous and never used. So the vaccine should be given in the muscle.