Illinois will pause use of the Johnson & Johnson vaccine "out of an abundance of caution" Health officials say a majority of Illinois' vaccine doses are from Moderna and Pfizer's vaccines U.S. regulators recommended a “pause” in administration of the single-dose Johnson & Johnson COVID-19 vaccine to investigate reports of potentially dangerous blood clots Get the answer to your most-asked COVID vaccine questions on our mobile NBC 5 Chicago app. Download it here for iOS or Android. "IDPH has notified all Illinois COVID-19 providers throughout the state to discontinue use of the J&J vaccine at this time," the Illinois Department of Public Health said in a statement. "In order to keep appointments, IDPH is strongly advising providers to use Pfizer-BioNTech and Moderna vaccines."