Hopefully it is nothing like the side-effects of the polio vaccines.
There’s a reason they cut back on those as soon as they could. It killed, and paralyzed people - just at a much lower rate than polio.
Polio was the bane of our (or my) parent’s generation. And the polio vax was still being given in developing countries up until the 1990’s or early 2000’s when Rotary International declared it eradicated. Polio vax and the eradication of the disease had been a big philanthropic / public health focus of RI for many years.