Which vaccine is generally given subcutaneously?

The MMR vaccine, which stands for Measles, Mumps, and Rubella, is typically administered subcutaneously. This method involves injecting the vaccine into the fatty tissue just beneath the skin. The subcutaneous route is specifically recommended for live attenuated vaccines like MMR because it allows for better immune response since these types of vaccines require certain conditions to replicate and elicit immunity.

In contrast, vaccines such as influenza and pneumococcal are generally administered via intramuscular injection. This route allows for a more rapid absorption of the vaccine into the bloodstream, which is more suitable for the types of immunological responses these vaccines provoke. Hepatitis A can be given via both the intramuscular or subcutaneous route, but it is more commonly administered intramuscularly.

Thus, the MMR vaccine's specific recommendation for subcutaneous administration is based on the characteristics of live attenuated vaccines and their requirements for effective immunogenicity.