Detecting rare blood clots was a win, but US vaccine safety system still has gaps
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5 May 2021Detecting rare blood clots was a win, but US vaccine safety system still has gaps
The quick detection of an ultra-rare blood clotting reaction in some COVID-19 vaccine recipients showed the power of a federal warning system for vaccine safety issues, but experts worry that blind spots in the program could hamper detection of other unexpected side effects.
