evidence: Concern has continued to grow over a small, but growing number of cases of a rare, but serious blood clotting disorders associated with the Johnson & Johnson coronavirus vaccine. In May, the Food and Drug Administration (FDA) put new restrictions on who can get the J&J vaccine, based on a fresh review of data on the life-threatening blood clots that have been associated with the vaccine. This was five months after the Centers for Disease Control and Prevention (CDC) endorsed a decision to give a preferential recommendation to the Pfizer-BioNTech and Moderna vaccines. [...] The clotting disorder is called thrombosis with thrombocytopenia syndrome (TTS), and it is rare—an updated safety analysis showed that, as of March 18, out of more than 18 million people who got J&J, 60 cases of TTS were reported and nine people died. The analysis was based on suspected cases of TTS reported to the government’s Vaccine Adverse Event Reporting System (VAERS). The risk appears to be greatest—1 in 100,000—in women ages 30 to 49. [...] The Pfizer-BioNTech and Moderna COVID-19 vaccines, both of which are mRNA vaccines and use a different method to protect against the virus, have not been linked to blood clots at this time.