Literature ReviewHypothesisHighlightedMalproduction of endogenous hydrogen gas in COVID-19MHID-3205850PMID: 359678412022Frontiers in Cellular and Infection MicrobiologySergej M OstojicThe molecular footprints of COVID-19 occur everywhere, even reaching the family of biologically active gases and gasotransmitters. Besides nitric oxide and hydrogen sulfide, COVID-19 might also alter the homeostasis of dihydrogen (H2), another gaseous bioactive molecule produced endogenously by the human gut bacteria. Many studies have shown various alterations of the gut microbiota in patients wit