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Researchers Seek Cause of Rare Clots Tied to Vaccines April 19, 2021 New evidence emerged last week that ties COVID-19 vaccines to extremely rare cases of people who develop blood clots and low platelets within weeks of being vaccinated. A team of researchers in the United Kingdom conducted an in-depth investigation of 22 patients who developed serious blood clots along with a drop in blood platelets after receiving a dose of the AstraZeneca vaccine, which is now called Vaxzevria. They also tested one additional patient who had clinical signs of a drop in blood platelets after vaccination. Nearly all the patients 22 of 23 tested positive for unusual antibodies to platelet factor 4, a signaling protein that helps the body coordinate blood clotting.

Stanford universityUnited statesUniversity of pennsylvaniaUnited kingdomPeter marksJames zehnderJohn wherryJohns hopkins universityInstitute for immunologyStanford university school of medicineNew england journalStanford university schoolBiologics evaluationJohns hopkinsஸ்டான்போர்ட் பல்கலைக்கழகம்ஒன்றுபட்டது மாநிலங்களில்