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Remdesivir is almost identical to GS-441524, a drug that has successfully cured Feline Intestinal Peritonitus (FIP) n cats. Until about four years ago, FIP, which is a caused by a corona virus, was 100% fatal in cats. Gilead was aware of this and the success with FIP may have been the underlying factor in using Remdesivir in Covid patients. https://www.theatlantic.com/science/archive/2020/05/remdesivir-cats/611341/