> Source?

The link I supplied was literally a source:

https://www.uab.edu/reporter/resources/be-healthy/item/9544-...

> 2. Vaccine side effects show up within weeks if at all

> That is not to say that there have never been safety issues with vaccines. But in each instance, these have appeared soon after widespread use of the vaccine began. "The side effects that we see occur early on and that's it," Goepfert said. In virtually all cases, vaccine side effects are seen within the first two months after rollout.

That is citing the director of the University's Vaccine Research Clinic.