Researchers have finally uncovered the molecular mechanism behind a rare but serious complication associated with certain COVID-19 vaccines. Vaccine-induced immune thrombocytopenia and thrombosis (VITT), an extremely rare clotting disorder triggered by the AstraZeneca and Johnson & Johnson vaccines (both adenovirus-vector based), results from an improbable biological coincidence. Scientists discovered that a combination of three factors—the presence of a specific gene variant, a particular mutation in antibody-producing immune cells, and prior exposure to similar adenoviruses—can cause the immune system to mistakenly attack a protein involved in blood clotting. Although these vaccines are no longer in use, this critical finding paves the way for designing next-generation adenovirus-based vaccines with even greater safety profiles.

https://www.nature.com/articles/d41586-026-00457-4



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