SAN ANTONIO – The U.S. Food and Drug Administration and Federal Trade Commission issued a warning letter Wednesday to a company selling products with the claim that they can prevent or treat COVID-19. “Despite previous warnings, the FDA is concerned that we are still seeing chlorine dioxide products being sold with misleading claims that they are safe and effective for the treatment of diseases, now including COVID-19. The sale of these products can jeopardize a person’s health and delay proper medical treatment,” said FDA Commissioner Stephen M. Hahn, M.D. COVID-19, the respiratory disease caused by the new virus, stands for coronavirus disease 2019. The disease first appeared in late 2019 in Wuhan, China, but spread around the world in early 2020, causing the World Health Organization to declare a pandemic in March.