COVID-19
Some people thought hydroxychloroquine, a medicine given to people with malaria, lupus, and arthritis, might work against COVID-19.  One study from China showed that COVID-19 patients who took hydroxychloroquine got better faster, but the study was not peer reviewed.  Other studies in France and China seemed to show hydroxychloroquine helped, but the doctors did not compare patients who took hydroxychloroquine to patients who did not, so they could not be sure it was the hydroxychloroquine that was helping them or whether it was something else. United States President Donald Trump said he was taking hydroxychloroquine and told other people to take it too, but Dr. Anthony Fauci, part of the White House official coronavirus task force, said no one could know for sure if hydroxychloroquine worked against SARS-CoV-2.  In March, the United States Food and Drug Administration allowed doctors to give hydroxychloroquine and another drug called chloroquine to COVID-19 patients, but in June, they told doctors to stop.  By then, more studies had shown that the drugs did not help much and could harm the patients' hearts.