As a result, EMA researchers will “evaluate all the available data to decide if a causal relationship is considered likely or not,” the bulletin reads It also noted there is “currently insufficient evidence” of a link between Moderna’s vaccine and cases of multisystem inflammatory syndrome. Capillary leak syndrome, according to the Mayo Clinic, is a rare disorder involving repeated leaks of large amounts of plasma from blood vessels into nearby body cavities and muscles. The condition—known as Clarkson’s disease—can result in a sharp drop in blood pressure that can lead to organ failure or even death.