Scientists tie platelet factor 4 to AstraZeneca COVID vaccine-related clotsUK researchers have uncovered the novel mechanism behind rare abnormal blood clotting seen in some AstraZeneca/Oxford vaccine recipients, according to a study today in the New England Journal of Medicine.The study involved clinical and lab evaluation of 23 previously healthy patients who experienced blood clots and thrombocytopenia (low platelet counts) 6 to 24 days after receiving the first dose of the AstraZeneca vaccine.

Most clots were cerebral venous thrombosis, while some were arterial thrombosis and venous thromboembolisms such as pulmonary embolisms.Twenty-one patients had antibodies for clot-promoting platelet factor 4 (PF4) on enzyme-linked immunosorbent

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United States	Cases: 46 252 513 Deaths: 750 423 Recovered: 0
India	Cases: 34 321 025 Deaths: 459 652 Recovered: 0
Brazil	Cases: 21 835 785 Deaths: 608 235 Recovered: 0
United Kingdom	Cases: 9 215 683 Deaths: 141 607 Recovered: 0
Russia	Cases: 8 494 589 Deaths: 237 619 Recovered: 0

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