There are videos of shaking after the second COVID-19 vaccine.

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In this Dec. 14, 2020, file photo, David Cheng, director of inpatient pharmacy, prepares the Pfizer-BioNTech COVID-19 vaccine in Los Angeles.(AP)

There are videos on Facebook that show women shaking and convulsing.A woman from Indiana claims to have taken the Moderna vaccine.A Louisiana woman claims to have taken the Pfizer shot.

Health officials don't know if either case was caused by the vaccine.Medical research has not identified the symptoms of the vaccine as side effects.

Health experts caution against drawing conclusions from a single event, but say people need to report any reactions so their cases can be investigated.

Videos circulating on Facebook and other social media show women shaking violently after receiving a vaccine.

The posts were flagged as part of Facebook's efforts to combat false news and misinformation on its News Feed.We have a partnership with Facebook.PolitiFact wanted to know more.

While both women say in the videos that they blame the shots for their conditions, experts have not verified the vaccines as the cause of either of their shaking.More than 51 million doses of the vaccine have been administered around the world, and there have not been any reported side effects.

A woman from Indiana claims that she suffered from uncontrollable shaking after taking the first round of the Moderna vaccine.

In one of her videos, a woman is on a bench.She says she received the vaccine on Monday.

She said she was in convulsions by Thursday morning.There is nothing that will convince me that this is not from the Moderna vaccine.

She was treated and released from a hospital after her video was posted.

The blood cultures yielded no answers.Doctors told her that her problem was likely stress related.The CDC told the Courier & Press that people who have taken the vaccine don't usually have symptoms.

PolitiFact reached out to Skelton, but hasn't heard back.She said in a Facebook post that she was raising money to pay for treatment.

A woman is struggling to walk across a hospital setting because she is shaking violently.

The woman is Angelia Gipson Desselle of Louisiana, and many of the videos were promoted by her son, who tagged her on Facebook.The videos of himself responding to critics had been viewed thousands of times before he removed them.

Desselle and Griner were contacted by PolitiFact.Griner spoke to a reporter for 30 minutes, but Desselle didn't reply.He said his mom wanted to get the vaccine because she works at a medical clinic.She got it in New Orleans.

She had seizure-like sensations in her left leg on Friday.She couldn't walk by Saturday.She was admitted to the hospital.

PolitiFact wanted to know if Desselle took the vaccine and what caused her symptoms.He wouldn't say where his mother got the vaccine or where she was admitted to the hospital.

After posting the videos, he received feedback from many social media users, including some who have been harassing him and his mom.He said that Desselle wants the medical professionals involved in her treatment to be safe.

The clinic where Desselle works was contacted by PolitiFact to inquire if anyone else had suffered side effects from the vaccine.The employer has not responded.

The videos of his mom were removed from his Facebook page.He told the reporter that his mom's boss and co-workers were getting harassed and that she wanted him to remove all the videos.

Her brain scans and blood tests were normal according to her friends.Wolff-Parkinson-White syndrome is a condition that can lead to an irregular heartbeat.It was not clear from the video if she has that condition or if doctors believe it played a role in her shakiness.

Kevin Litten is a spokesman for the Louisiana Department of Health.

Litten said that only one person had a serious effect that needed to be hospitalized.The symptom was lightheadedness and gastrointestinal distress.The person was treated and released.

The CDC has no adverse event data regarding a case of this nature out of Louisiana, according to an email from a CDC spokesman.

Medical experts warn that more stories will surface of people claiming a number of side effects if more people get vaccinations.The public has a challenge in determining what to make of these testimonials.

It's not yet known if these symptoms were brought on by the vaccines.They aren't considered common if they were.Public health officials and vaccine experts are not aware of a link between uncontrollable shaking and the COVID-19 vaccine.

Dr. Paul Offit, director of the Vaccine Education Center at Children's Hospital of Philadelphia, who also sits on the Food and Drug Administrations vaccine advisory committee, said he hasn't heard of this being associated with the vaccines.

The director of the Immunology Graduate Program at Harvard Medical School said he wasn't aware of any adverse vaccine reactions.He said that some people feel tired a day after the second dose, but that it usually goes away in less than 24 hours.

That is in line with official findings by the FDA and the CDC.In Pfizer and Moderna's clinical trials, vaccine recipients reported mild or moderate reactions, such as pain at the site of injection, as well as fatigue, headaches, and joint and muscle pain.These are usually resolved in a day or two.

When you give vaccines to a large group of people, health experts say the issue of coincidence is common.Many adults have underlying illnesses that can put them at greater risk for health events, as opposed to children, who are by and large healthy.

According to Dr. William Schaffner, the most important thing for people to do is to report any reactions so their cases can be investigated.He warned against drawing conclusions from a single event.

"When information comes in, it's under constant review by the FDA and CDC, because you can't conclude from an individual event that the vaccine caused the occurrence, but you have to investigate it further," Schaffner said.There are things that are unrelated to what's happening.We know that some things are going to happen, and someone will think there is a relationship to an event, which is not to say that there isn't, but those things must be investigated first.

He said that he has not seen any shaking or related reactions in the over 20,000 doses given at his medical center.

McDonald said that the vaccines are safe and effective.Many people don't have any side effects after the vaccine, but some will have pain or swelling at the injection site.These are signs that your body is protecting you.

People who have had adverse reactions to other shots should consult a physician before getting the vaccine, according to the CDC.Clinical trials show that the Pfizer vaccine is safe and effective for people with underlying medical conditions, and is especially important for those who are at an increased risk for severe COVID-19.

The vaccine is not recommended for people who have had a severe allergic reaction to an injection in the past, as long as they take precautions.

People with peanut allergies, for example, can still get the vaccine.If you have an allergic reaction after getting the vaccine, you just need to wait for 30 minutes in the area where you got it and someone will give you a shot of epinephrine.

Health officials recommend hanging around for 15 minutes to watch for any reactions.

The Louisiana woman convulses after being injected with the experimental Pfizer COVID Shot.

"CDC says vaccine side-effects 'tend to be mild' in response to Indiana woman's claims in viral video."

The use of Pfizer-bioNTech COVID-19 vaccine by the Centers for Disease Control and Prevention.

Kevin Litten is a spokesman for the Louisiana Department of Health.

Email interview with Dr. Paul Offit, director of the Vaccine Education Center at Children's Hospital of Philadelphia.

Email interview with Dr. Shiv Pillai, director of the Immunology Graduate Program at Harvard Medical School.