A Moderna Covid-19 vaccine participant discussed her experience after taking two shots of the experimental drug in August and September.
Susan Froelich recounted the illness she experienced after taking the second shot, which she said could have been a placebo and not the vaccine.
"I woke up with a horrible stomach ache and headache, and it was like I was at the beginning stages of a bad flu," Froelich told CNN during its global coronavirus town hall. "And so, I didn't have anything to take for it at the time so I was in a lot of pain until about four hours later, when my husband woke up and I had him go get me some Naproxen."
Froelich said she took 440 milligrams of Naproxen, which cleared her symptoms but "it was like every part of my body was hurting for about four hours."
"If I hadn't Naproxen right away, I think those symptoms would've abated more quickly. But my muscles hurt, my joints hurt, my bones hurt, my jaw hurt. But it was for such a short time," she said.