From CNBC:

Joanna Oakley got her annual flu shot in 2015 and immediately knew something was wrong.

“It felt like it hit bone right away. And over the next few days, I noticed it was increasingly sore, and it got to where I couldn’t move my arm, I couldn’t turn my steering wheel in my car,” she said.

As a nurse, Oakley is trained to give injections.

“It wasn’t until it happened to me that I started researching, that I found, it actually did happen more often, than I would ever imagine,” she said.

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