The U.S. Food and Drug Administration (FDA) has changed the end date for a key study on post-vaccination heart inflammation without notifying the public.

Pfizer was supposed to complete a study on the occurrence of subclinical myocarditis, or heart inflammation, after receipt of its COVID-19 vaccine. The completion date was listed by the FDA in 2021 as June 20, 2022. Pfizer was also supposed to submit the results of the study to the FDA by the end of 2022 as part of a list of requirements the FDA imposed as a condition of approving Pfizer’s jab.

But after the deadline passed, the FDA quietly changed the date.