What dose and schedule of IIV should be administered to a 9-year-old boy who has never been vaccinated?

For a 9-year-old boy who has never been vaccinated against influenza, the appropriate recommendation is to administer two doses of the inactivated influenza vaccine (IIV) to ensure adequate immune response. The first dose is given, followed by a second dose at least four weeks later. This is particularly important for children who are receiving the vaccine for the first time, as their immune systems require that initial boost to develop robust immunity.

One dose during flu season would not provide the necessary immunity for a child who has never been previously vaccinated, as it does not account for the need for a priming dose followed by a booster dose in this age group. Therefore, just giving one dose would leave the child underprotected against the influenza virus.

Annual vaccination is recommended for all individuals starting from the age of 6 months, but this is not sufficient for someone who is just beginning their vaccination journey. The two-dose series in the first year of vaccination serves to enhance the immune response and help establish long-term protection against influenza.

It's essential to follow these guidelines to ensure that the child has the best possible defense against influenza during flu season.