The Birmingham Community Healthcare immunisation team is administering the vaccine to all children in school years 1, 2 and 3 for whom consent has been given.
Gerry Hudson, headteacher of Starbank School in Small Heath, Birmingham is among heads across the city who are backing the Flu Busters campaign.
"One knows, working in a very busy school, how easily viruses are spread," said Gerry.
"It's certainly a concern for us because it affects children's attendance, they miss learning and they may pass it on to others. There's also the issue of taking the virus home to elderly relatives who may have health conditions where the flu causes them even more problems.
"One of the things I like about the new suggestion is the nasal spray which the children are likely to find less invasive than having an injection."
www.bhamcommunity.nhs.uk/imms