Certain jabs can cause immune cells to attack the body, leading to myocarditis and pericarditis, particularly in young men, scientists say
Certain Covid-19 vaccines can trigger immune responses that may inflame heart tissue and lead to potentially fatal complications in rare cases, with young men being especially susceptible, according to a new study.
The paper, authored by Stanford University researchers and published in the Science Translational Medicine journal, examined why some patients developed myocarditis or pericarditis after receiving mRNA jabs such as those produced by Pfizer and Moderna.
Researchers found that immune cells can, in some cases, recognize the foreign RNA delivered by the vaccines and mount a strong response. In rare instances, this response has led to the release of large amounts of cytokines – immune-signaling proteins that can damage heart cells.
Vaccine-associated myocarditis has occurred in about one in 140,000 people after a first dose and around one in 32,000 after a second dose, according to figures cited by The Telegraph, with incidence peaking among males aged 30 or younger.
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