What is the appropriate needle gauge for an Intradermal (ID) injection?

The appropriate needle gauge for an intradermal (ID) injection is typically in the range of 26-27 gauge. This size allows for the precise delivery of the vaccine or medication into the dermal layer of the skin, which is necessary for this type of administration. ID injections require a smaller gauge needle than other types of injections, such as intramuscular (IM) or subcutaneous (SQ) injections, because of the sensitivity and thinness of the skin in the injection site.

Using this smaller gauge helps minimize tissue damage and ensures that the vaccine is administered at the correct depth, allowing for proper immune response and minimizing discomfort for the patient. The other options provided involve larger needles that are more suitable for other forms of injection, such as IM or SQ, where more substantial delivery into the muscle or fat layers is required.