This article from the American College of Physicians (ACP) provides a deeper dive into the pause of the J&J vaccine, which was recommended by the FDA and CDC on April 13, 2021, after six cases of cerebral venous sinus thrombosis (CVST) among patients who had received the vaccine was reported. The pause is being done to determine whether the vaccine is associated with any other types of thrombosis and to develop more specific recommendations for its use, possibly based on age.