FORT WAYNE, Ind. (Fort Wayne's NBC) -- Four healthcare workers and first responders told us what happened to them after they received their second dose of the coronavirus vaccine.
While some people only feel a sore arm, some can experience other symptoms.
One woman told us hers lasted about 24 hours after she got her second shot.
"After it was administered I was slightly nauseous that day, and the next day a sore arm. It wasn't awful at all. I actually worked the next day, I was just a little more tired than normal and my arm was tired," Sara Bradtmueller said.
Researchers believe the first dose of the coronavirus vaccine prepares your body to make antibodies to the virus, and that the second dose is what kicks your body into making them.
That's why some people have symptoms that show up several hours later that can mimic in a small way what COVID-19 can do to you, including chills, bad shakes, and a very sore arm with swollen lymph nodes.
"I had that all night, got nauseated. I did have to get up and go to work the next day. I did, I just felt very fatigued. I took Tylenol Motrin, and after a day I felt just fine," Melissa Komrska said.
While three of our people went to work the next day, another said his symptoms came on overnight, and he had to stay home from work.
"Felt really tired, very fatigued, exhausted. I started to get a little bit of a cough. I felt really warm. I did check my temperature, I had a temperature of about 99, and I started to get chills, too," Paul Kipfer said.
Another man said he spent about five hours after work wrapped up in blankets because he couldn't get warm.
"I just started getting the chills, body ache, muscles ached like I've never had before. And it hurt to move," Stewart Bender said.
All of them said the symptoms subsided within a day.
Some of them took Tylenol, but others just rode it out.
And they all said what they endured was nothing compared to what they've seen in COVID patients who can't breathe.