The paper is not a study in itself, it is a specific medical case that was chosen due to the possible link between the SARS-CoV-2 vaccine and the acute hepatiti

The paper is not a study in itself, it is a specific medical case that was chosen due to the possible link between the SARS-CoV-2 vaccine and the acute hepatitis this person developed. The hepatologists found SARS-CoV-2 specific T cells (determined via ELISA) in the liver of a 52-year-old male which had caused an autoimmune reaction in which the patient developed acute hepatitis. It was ruled out to be any of the known hepatitis viruses through serology and PCR testing. The link between SARS2 and the hepatitis came from the high amount of SARS2 specific CD8 T-cells. However, they also found Epstein-Barr virus specific T-cells in the same areas, although the SARS2 specific T-cells were activated cytotoxic with a high correlation to the concentration of hepatitis. I'd say that shows a strong correlation and it is possible this individual developed hepatitis from the Pfizer vaccine (BNT162b2 mRNA). There is nothing that suggest that this is in any way or form an expected side-effect from the vaccine itself. Edit: Note that autoimmune diseases can come from almost anything. There will be a very few cases where the immune reaction to the vaccine itself will cause an autoimmune disease. However, most of the children that have developed hepatitis are under the age of 5 and therefore not eligible to receive the SARS-CoV-2 vaccine in the countries where the reports are from. However, a lot of the children with hepatitis have had an SARS-CoV-2 infection, which is why that link is currently being investigated by hepatologists.