"the trials show a reporting bias on the harms of the live attenuated influenza vaccine (the form of vaccine delivered nasally). “Influenza vaccines are about marketing and not science,” he says. “We have few trials, and masses of very poor quality observational evidence. We have presented evidence of considerable reporting bias, which governments continue to ignore. The science is missing and so making an informed decision is very difficult.”
https://www.theguardian.com/lifeands...-spray-vaccine