Scientists at Yale have identified signs of a condition they believe may follow mRNA Covid vaccination.
Earlier this week, Ivy League researchers described post-vaccination syndrome, or PVS. They said symptoms can last years after shots from Pfizer or Moderna. Reported signs include brain fog, exercise intolerance, insomnia, and heart palpitations.
Also reported were numbness, tinnitus, headaches, dizziness, and a burning sensation. The Yale team said some patients show immune cell changes. Some also had a dormant virus reactivate, causing flu-like symptoms. The researchers stressed the study was small and ongoing.
However, the scientists said there is no proof vaccines cause these symptoms. Many symptoms existed before the pandemic. Lead researcher Dr Akiko Iwasaki said the findings came from early work. The paper was not peer-reviewed and appeared on MedRxiv.
Meanwhile, the study reviewed blood samples from 42 Americans with PVS and 22 without it. Samples were collected from December 2022 to November 2023. Most patients reported symptoms after a first or second vaccine dose. Some reported onset after a third or fourth dose.
Finally, outside experts urged caution. Dr John Wherry told The New York Times,
“I would like to see more data on this topic.”
Dr Adam Gaffney wrote on X,
“There’s nothing wrong with studying vaccine side effects. There is a problem with this study.”
He added,
“And to coin this novel syndrome without even proving that it’s caused by the vaccine is very worrisome to me.”