Researchers Probe hyperlink Between Covid-19 Vaccines and Myocarditis

contemporary reports have shown that the effectiveness of Covid-19 vaccines is reducing, notwithstanding specialists say the photographs nonetheless work well. WSJ explains what the numbers mean and why they don't tell the full story. picture illustration: Jacob Reynolds/WSJ

As U.S. fitness authorities extend use of the main Covid-19 vaccines, researchers investigating heart-connected hazards linked to the photographs are exploring several rising theories, together with one situated on the spike protein made in accordance with vaccination.

Researchers aren't definite why the messenger RNA vaccines, one from Pfizer Inc. and associate BioNTech SE and the other from Moderna Inc., are likely inflicting the inflammatory coronary heart conditions myocarditis and pericarditis in a small number of cases.