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Out of approximately 19 million doses of Johnson & Johnson administered in the US, 60 cases of thrombosis have been detected, of which 9 are fatal. For this reason, the American FDA has announced that it will limit the use of the vaccine against Covid Johnson & Johnson due to the risk of “rare but serious thrombosis”. For the same reason, the CDC, since December the American Center for Disease Control, has recommended using Pfizer and Moderna, instead of Johnson & Johnson. The vaccine may henceforth be used only for adults who reject Pfizer or Moderna “for personal reasons” or who cannot receive them.