Here's what we know about J&J COVID vaccine in Idaho -- and what to do if it affects you Hayat Norimine and Nicole Foy, The Idaho Statesman Apr. 13—Idaho health officials on Tuesday advised vaccine providers to pause using Johnson & Johnson COVID-19 vaccines on advice from the Centers for Disease Control and Prevention. The CDC and Food and Drug Administration recommended that states temporarily halt the use of the single-shot vaccine, also known as the Janssen vaccine, after reports that six women in the U.S. developed a rare blood-clotting disorder. Dr. Christine Hahn, Idaho's lead epidemiologist, said during a press conference Tuesday that the adverse reactions to the vaccine remain "extremely rare," considering about 6.8 million people in the U.S. have received it. The clotting issue has not affected anyone in Idaho who got the single-shot dose, state officials said.