The flu vax may contain adjuvants such as squalene which increases pathological autoimmune response exponentially. Aluminum, thimerosal (yes they are still giving mercury in shots) a "predicted" variant or sequence of a flu virus that may or may not be applicable, that is if viral theory is even legitimate. At best, the flu shot has 30-40% effectiveness against the flu. Many times the numbers for effectiveness of the vaccine don't even register.
Side effects include Gillian Barre, increase in autoimmune diseases (arthritis, Crohn's etc) and it has been statistically measured that 5 yearly consecutive flu shots increase Alzheimer's disease by 100% ( probably from the aluminum)
At this point I would be wary that any immunization including the flu shot would carry agenda driven toxins and pathogens (spike proteins) to support the current pandemic craziness and I would refuse any jabs.