The Chinese swine flu vaccine from the 70s took 5-10 years to kill people, you may want to extend that 6 month idea.
The government was all in a panic about the 1976 Swine Flu but its side effect was: “After the program began, the vaccine was associated with an increase in reports of Guillain-Barré Syndrome”.
Lucky me. After my shot my bout of Guillain-Barré Syndrome was very mild and lasted about 6 months. I haven’t had a flu shot since then and have only had the flu twice. The question for a person my age (79) is what will kill you first. Catching COVID-19 or getting the Gates vaccine.