Protein impurities found in AstraZeneca’s Covid-19 vaccine stir debate
Compounds might cause side effects but are unlikely to be behind extremely rare blood-clotting events
Researchers in Germany report substantial amounts of human and viral proteins in AstraZeneca’s coronavirus vaccine. Although the study is not yet peer reviewed, it suggests that these impurities could be linked to the strong reaction seen in many people two to three days after their jab. The preprint also states that it is conceivable, albeit doubtful, that these proteins could be linked to rare blood-clotting events.