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Mr. Marte, the paramedic, and his partner, Cullen McGraw, administered hydroxocobalamin and sodium thiosulfate, treatments to reverse the effects of cyanide, the poisonous chemical compound found in smoke.

Microbiota-derived hydrogen sulfide is converted to thiosulfate by colonic epithelial cells.

Microbiota-derived hydrogen sulfide is converted to thiosulfate by colonic epithelial cells.

A source of one such electron acceptor is sulfate-reducing species of Desulfovibrio from the microbiota, which release hydrogen sulfide, a compound that is converted to thiosulfate by the epithelium of the colon to avoid toxicity103.

Sodium thiosulfate is the fixing agent still used today and is relatively easy to prepare.