You may have had friends & family sending you this study boys & girls:
John Barthelow Classen is an American immunologist and anti-vaccinationist. He received his M.D. from the University of Maryland, Baltimore in 1988, his M.B.A. from Columbia University in 1992 and obtained his medical license in October 1997. He is best known for publishing research concluding that vaccines, in particular the Hib vaccine, cause insulin-dependent diabetes mellitus, a hypothesis he proposed based on experiments he conducted on mice in 1996. His views are disputed and considered unverified.
A widely-reposted 2021 Facebook post claiming that the mRNA vaccines against COVID-19 could cause prion diseases was based on a paper by Classen. The paper was published in Microbiology and Infectious Diseases, whose publisher, Scivision Publishers, is included in Beall’s list of publishers of predatory journals. Vincent Racaniello, professor of microbiology and immunology at Columbia University, described the claim as “completely wrong”.