The Food and Drug Administration and the Centers for Disease Control have asked vaccine administrators to stop using the Johnson & Johnson one-dose COVID-19 vaccine. The federal agencies called for this pause after six women experienced dangerous blood clots after getting the J&J shot. Dr. Ruth Berggren is an infectious diseases doctor and the director of the Center for Medical Humanities and Ethics at UT Health San Antonio. She says this recommended pause is appropriate, but stresses that the reports of blood clots in those who’ve received the J&J shot are exceedingly rare.