How is the BCG vaccine administered?

Correct option is A

The BCG (Bacille Calmette-Guérin) vaccine, used to prevent tuberculosis (TB), is administered intradermally (into the skin). It is typically given on the upper left arm of newborns. Intradermal administration allows for a slow immune response, leading to effective long-term immunity against severe forms of TB, such as miliary TB and TB meningitis.
Explanation of Each Option:
· Intradermal: Correct answer; BCG is given into the skin layers, ensuring slow absorption and a sustained immune response.
· Subcutaneous: This method involves injecting into the fatty tissue under the skin, but it is not used for BCG as it may reduce vaccine efficacy.
· Intramuscular: This method is used for vaccines like DTaP, hepatitis B, and influenza, but not for BCG, as deep muscle injection may lead to improper immune activation.
· Intravenous: Vaccines are never given directly into veins, as this can lead to severe side effects and is not a recommended practice.