We provide a brief review of the significance of platelets, mitochondria, vitamin D, serotonin, and the gut microbiome in COVID-19. We hypothesize that hyperactive platelets and mitochondrial dysfunction, as well as low vitamin D level, gut dysbiosis, and increased serum serotonin produced by enterochromaffin cells, may all represent important aspects in the pathophysiology of COVID-19.
Keywords: COVID-19; Platelets; SARS-CoV-2.; gut-brain axis; mitochondria; serotonin; vitamin D.
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