Brain Inflammation and the mRNA Vaccines

Three large insurance databases showed sharp increases in cases of severe brain inflammation after the Covid mRNA shots, according to a new peer-reviewed paper.

People who received the Pfizer jab or booster had a 40 to 70 percent higher chance over the next six weeks of encephalitis or encephalomyelitis. The Moderna jab carried an even higher risk after the second primary dose or a booster.

Encephalitis is inflammation of the brain itself, while encephalomyelitis is inflammation of nerve sheaths in the brain or spinal cord. Both can range from relatively mild conditions to serious or even fatal illnesses. The researchers reported 47 cases following Pfizer’s jab; they did not disclose an exact figure for Moderna’s.

Though the finding was published in the peer-reviewed journal Vaccine, it has received little attention – in part because the authors presented the findings in a way that made them seem less statistically robust than they were.


The paper’s finding comes after a stream of case reports in medical journals of brain inflammation following the mRNA shots.

The reports have come from physicians worldwide, including BelgiumJapanTaiwanPeru, and Thailand – and even the United States, an unusual development since American physicians are often reluctant to publicize serious mRNA vaccine side effects.


VAERS, the federal vaccine adverse events reporting system, also contains scores reports of severe cases of encephalitis or encephalomyelitis shortly after Covid shots, although those are not peer-reviewed.

(SOURCE: VAERS case report 2057411-1)

Encephalitis and encephalomyelitis are rare conditions that can occur following infections or auto-immune reactions. Both can be fatal in serious cases if untreated.

The most likely mechanism for potential mRNA vaccine encephalitis is that the shots overstimulate the immune system and cause the body to attack its one tissues in what physicians sometimes call a cytokine storm. As Taiwanese physicians explained in describing two cases:

Exposed mRNA or vaccine components may also be detected as antigens [substances that stimulate the immune system], further resulting in aberrant proinflammatory cytokine cascades and activation of immune signaling pathways…

Some patients in the case reports have had complete recovery after treatment with with steroids or other immunosuppressants. Others remained injured or even comatose, according to the case reports.

The Vaccine paper appeared online on September 27 and in print October 26. It draws on the Food and Drug Administration’s Biologics Effectiveness and Safety database, which tracks insurance claims in people who have received vaccines or other treatments.

In this case, the researchers followed claims for 17 different potential side effects, including myocarditis, in three large commercial insurance databases including more than 16 million vaccinated people. They they compared the results to the background rates of the conditions before the shots.

This method probably substantially understates the risk of short-term post-vaccine side effects, because people who are ill or feeling ill – seriously or not – are likely to delay being vaccinated. Thus vaccines tend to be given to people at times when they are at lower risk for illness or death.

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