Radio Iowa You are here: Home State puts J&J vaccine use on hold during federal review The Iowa Department of Public Health is putting a hold on the use of the Johnson & Johnson COVID-19 vaccine. The move by the state health department comes after the Centers for Disease Control and the FDA announced they are reviewing data involving six reported U.S. cases of a rare and severe type of blood clot in people who received the J&J vaccine. Federal officials say the adverse events appear to be extremely rare. The CDC and FDA plan to provide additional information later today. Iowa has used part of its allocations of the one-dose J&J vaccine for college students in an effort to get them vaccinated before the end of the semester.