Thrombosis remains a global health concern, necessitating research into its underlying mechanisms. Utilizing a high-speed bright-field microscope based on optical frequency-division multiplexing and microfluidics, we performed image-based single-cell profiling and temporal monitoring of circulating platelet aggregates that are the precursors to thrombosis. Our analysis encompassed 41 thrombosis patients, 110 COVID-19 patients, and 11 healthy individuals. By investigating the morphological changes of platelet aggregates under the influence of thrombosis, COVID-19, and COVID-19 vaccination, we observed distinct morphological alterations in platelet aggregates across different conditions, which shed light on the interplay between platelet aggregation and thrombotic events.
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