Mayo Clinic Study Reveals J&J Vaccine Recipients Four Times More Prone to Blood Clots

The Mayo Clinic released a study on Nov. 1 revealing that Minnesota residents from Olmsted County who received the Johnson & Johnson COVID-19 vaccine are 3.7 times more likely to develop blood clots.  

The Study

Published by the JAMA network, the study analyzed blood clot case numbers that were reported to the CDC Vaccine Adverse Event Reporting System (VAERS) between Feb. 28, 2021 (the date that the vaccine was approved), and May 7, 2021, comparing them to incident case numbers before the pandemic, between Jan. 1, 2001, and Dec. 31, 2015. The study gained approval from the Mayo Clinic institutional review board.

While researching the data from pre-pandemic incident cases, the Mayo Clinic found that 39 Olmsted County residents experienced acute incident cerebral venous sinus thrombosis (CVST), with 28 of those patients having predisposing risk factors such as an infection, birth control use, or active cancer within 92 days before the CVST event.

Evaluating VAERS data from after the J&J vaccine approval date, the Mayo Clinic discovered that 46 potential CVST cases were reported to VAERS within 92 days of receiving the vaccine. Out of the 46 cases, 8 were ex...

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