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A nurse who has a condition that causes her to faint after experiencing pain passed out after receiving the Covid vaccine.
Tiffany Dover, a nurse manager at CHI Memorial hospital in Tennessee, was one of the first to receive the new Pfizer/BioNTech jab on Thursday (17 December).
But after having the shot, Ms Dover started feeling a bit unwell and fainted.
She says, though, that this happens all the time as she has a condition that causes her to pass out when she experiences pain.
Speaking to WRCBTV, she said it was nothing to worry about.
"I have a history of having an over-reactive vagal response, and so with that if I have pain from anything-hangnail or if I stub my toe - I can just pass out," she told the channel.
Director of Hospital Medicine Dr Lee Hamilton said seeing the vaccine rolled out in the US was a huge breakthrough.
He said: "To start to begin to see that light at the end of the tunnel and to think that I'm fortunate enough to be part of that."
And when asked about being among the first to receive the shot, he added: "It's the right thing to do. It's safe. It's ultimately what's going to lead us out of this darkness."
If you're sat there worried, don't be, fainting is a common occurrence when people have any kind of vaccine.
According to the U.S. Centers for Disease Control and Prevention, around 3.5 percent of women and three percent of men (in the US) have fainted at some point in their life due to having a jab.
Specialists at Johns Hopkins University say that fainting can often be caused by nerves.
A spokesperson said: "Our bodies can react in ways that seem unconnected to what we're thinking. It's possible for someone to feel nervous without realizing it.
"When we're scared or upset, we can begin to hyperventilate. This kind of fast, shallow breathing lowers the amount of carbon dioxide in our bodies, and that can lead to fainting."
If you're concerned about how you will react if/when you get the vaccine, there are some things you can do to keep calm.
Johns Hopkins added: "Breathe slowly and deeply before the shot and think of something relaxing,.
"Or distract yourself. Bring a friend along or play a game that requires intense concentration."
As is often the case online, unfortunately, there's a lot of misinformation and conspiracy theories being shared with regards to the vaccine.
In a blog post, the social media giant said that from Monday it would begin advancing its Covid-19 policy and removing tweets that contain potentially dangerous misinformation.
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