From the frontiers of COVID-19 vaccinology

 "The US Centers for Disease Control and Prevention and the Food and Drug Administration are checking to see if Johnson & Johnson's Janssen vaccine also might cause the blood clots. Both AstraZeneca's vaccine and the J&J vaccine use common cold viruses called adenoviruses as a carrier and some experts suspect the body's response to those viral vectors might underlie the reaction."

Note that neither the Pfizer nor the Moderna vaccine use a viral vector. https://www.cnn.com/2021/04/16/health/blood-clots-vaccine-possible-cause/index.html

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