President Trump's enthusiastic embrace of a malaria drug that he now says he takes daily - and the resulting uproar in the news media - appears to be interfering with legitimate scientific research into whether the medicine might work to prevent coronavirus infection or treat the disease. The drug, hydroxychloroquine ... is also widely used to treat lupus and other autoimmune diseases. But specialists - including Dr. Anthony S. Fauci, the government's top infectious disease expert - say the jury is still out. Mr. Trump's frequent pronouncements and misstatements - he has praised the drug as a game changer" and a "miracle" - are only complicating matters. Last week, the National Institute of Allergy and Infectious Diseases, which Dr. Fauci leads, announced a 2,000-patient study to determine whether hydroxychloroquine, when combined with the antibiotic azithromycin, "can prevent hospitalization and death from Covid-19," joining more than 50 other clinical trials that are continuing in the United States. Researchers around the country said the controversy was depressing enrollment in their clinical trials. The president's trade adviser, Peter Navarro ... said "hydroxy hysteria" in the news media - not Mr. Trump - was to blame. "Has the media's war of hysteria on hydroxychloroquine killed people?" Mr. Navarro asked in an interview. "If the scientific evidence does indeed prove that the medicine has both prophylactic and therapeutic value, the answer is yes."