Long lines form every morning in one of the Bolivian cities hardest hit by the coronavirus pandemic as desperate people wait to buy small bottles of chlorine dioxide, a toxic bleaching agent that has been falsely touted as a cure for COVID-19 and myriad other diseases. The rush in the city of Cochabamba to buy a disinfectant known to cause harm to those who ingest it comes even after the Bolivian Health Ministry warned of its dangers and said at least five people were poisoned after taking chlorine dioxide in La Paz, the capital. Dr. Antonio Viruez, who is treating the five at a hospital, said one incorrectly believed he had COVID-19 and developed pneumonitis, an inflammation of lung tissue, after taking chlorine dioxide and a medication used to treat parasite infestations. The other patients are improving, he said. “The Health Ministry cannot risk recommending something that doesn´t have a scientific basis,” said Miguel Ángel Delgado, a senior ministry official. However, Bolivia´s opposition-controlled congress is promoting the use of chlorine dioxide. Last week, the Senate approved a bill authorizing the emergency “manufacture, marketing, supply and use of chlorine dioxide solution for the prevention and treatment of coronavirus.” The bill would require the approval of interim President Jeanine Áñez, who is in quarantine after testing positive for the new coronavirus. She has sparred with opposition lawmakers loyal to Evo Morales, the former leader who was forced to resign last year after an election marred by irregularities. Many fearful residents in Cochabamba, where opposition support is strong, are giving chlorine dioxide a try. Cochabamba has reported about 440 deaths from COVID-19, or one-quarter of the total number of reported deaths in Bolivia. The real toll is believed to be higher. “I am afraid. I have to try it,” said Andrés Poma, a 34-year-old teacher who is skeptical that beleaguered health services can help him if he gets sick. “What am I going to do? Wait to die at the door of the hospital or at the door of my house?” Federico Anza, who sells chlorine dioxide at his Cochabamba store, said thousands of people have bought it, consuming it in drops. “My wife and I took it and nothing happened to us,” he said. He said his clients had not fallen ill after taking the agent, though provincial health authorities reported 10 cases of poisoning from chlorine dioxide in the past week. The governor of Cochabamba state, Esther Soria, said she supports a plan for a state law authorizing the use of chlorine dioxide and traditional medicine to treat COVID-19. Cochabamba’s mayor, José María Leyes, said he favors the free distribution of the bleaching agent to treat patients. But Fernando Rengel, president of the Cochabamba´s scientific association, said there are old beliefs that the toxic substance is “miraculous” and cures cancer, AIDS, malaria and other diseases, “but there is no scientific study that proves that it cures any disease.” Chlorine dioxide is one of a number of fake cures that have been promoted, often by fringe groups online, since the pandemic began. In April, a federal judge in South Florida ordered a Colombia-based group, the Genesis II Church of Health and Healing, to stop selling a related product, Miracle Mineral Solution, in the US Prosecutors said Genesis marketed the solution as a treatment for COVID-19, autism and other ailments. The US Food and Drug Administration has previously issued public warnings that MMS can cause nausea, vomiting, diarrhea and severe dehydration. In April, US President Donald Trump mused about whether disinfectants could be injected or ingested to fight COVID-19, prompting intense blowback from doctors and other health officials.