Fig. 2

Fluorescence microscopy of haematocrit samples, showing representative micrographs of platelets. A, B show representative micrographs from healthy individuals. C, D show hyperactivated platelets in COVID-19 and E–H show representative micrographs from platelets from Long COVID/PASC samples. White arrows show aggregated platelets. Platelets in the haematocrit were incubated with the fluorescent markers PAC-1 (green fluorescence) and CD62P-PE (purple fluorescence)