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 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. [...] While the risk for a rare blood clot is low, anyone who still gets the Johnson & Johnson vaccine should know about early symptoms of the disorder. The CDC recommends seeking immediate medical care if you develop any of the following symptoms after getting the shot, especially if you are a woman aged 50 or younger: