Researchers have found a link between the AstraZeneca Covid-19 vaccine and a rare but fatal blood clotting disorder. The disorder, known as vaccine-induced immune thrombocytopenia and thrombosis (VITT), has been associated with the AstraZeneca vaccine. A study from Flinders University in Australia and other international experts found that the antibodies responsible for VITT share identical molecular fingerprints with those found in cases of classic adenoviral vector VITT.