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DeAgostini / Getty / Katie Martin / The Atlantic For weeks, Americans looked on as other countries grappled with case reports of rare, sometimes fatal blood abnormalities among those who had received the AstraZeneca vaccine against COVID-19. That vaccine has not yet been authorized by the FDA, so restrictions on its use throughout Europe did not get that much attention in the United States. But Americans experienced a rude awakening this week when public-health officials called for a pause on the use of the Johnson & Johnson vaccine, after a few cases of the same, unusual blood-clotting syndrome turned up among the millions of people in the country who have received it.

European medicines agencyAstrazeneca vaccineAtal blood abnormalitiesJohnson vaccineSe of the johnsonMportant spike proteinIde effect of the astrazeneca vaccineBlood clotsEuropean medicines agencyLow platelet countVaccine dosesCase reportsUnusual bloodAndreas greinacherNusual clotting eventsAtients blood samples