FDA Strengthens Warning Over Severe Condition Linked to Johnson & Johnson’s COVID-19 Vaccine

U.S. drug regulators this week formally strengthened a warning to Americans regarding a severe condition linked to Johnson & Johnson’s COVID-19 vaccine.

Blood clots and low blood platelet levels, known as thrombosis with thrombocytopenia syndrome (TTS), are now listed as a contraindication, or a medical reason for somebody not to get the shot.

“Do not administer” the vaccine to individuals with a history of the set of conditions following the vaccine or any other adenovirus-vectored COVID-19 vaccine, the Food and Drug Administration (FDA) says in an updated fact sheet (pdf) for health care providers...