Which combination of vaccine, route, and site is correct?

The combination of vaccines, routes, and sites is critical in ensuring effective immunization. In the context of the influenza vaccine, both the intramuscular route into the deltoid (shoulder) and the intradermal route into the same site are acceptable practices.

Administering the influenza vaccine intramuscularly into the deltoid is the most common route, especially for adults and older children. This method allows for a good absorption of the vaccine and an effective immune response.

On the other hand, the intradermal route has been used for the influenza vaccine and is especially beneficial for certain populations, including those with a higher risk of adverse effects or those receiving a specific type of influenza vaccine designed for intradermal use.

Thus, both routes into the deltoid muscle site can be valid depending on the specific vaccine formulation and the recommendations of the health authority. This clarity signifies that the correct answer is that both combinations can be accurate, reflecting the flexibility in vaccine administration routes.