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Activation of endothelial cells following severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) infection is thought to be the primary driver for the increasingly recognized thrombotic complications in coronavirus disease 2019 patients, potentially due to the SARS‐CoV‐2 Spike protein binding to the human angiotensin‐converting enzyme 2 (hACE2). Vaccination therapies use the same Spike sequence or protein to boost host immune response as a protective mechanism against SARS‐CoV‐2 infection. As a result, cases of thrombotic events are reported following vaccination. Although vaccines are generally considered safe, due to genetic heterogeneity, age, or the presence of comorbidities in the population worldwide, the prediction of severe adverse outcome in patients remains a challenge. To elucidate Spike proteins underlying patient‐specific‐vascular thrombosis, the human microcirculation …