A day earlier, the World Health Organization recommended that its researchers continue to study the drugs’ potential use against coronavirus, restarting a paused trial.

And researchers across the U.S. are still testing the drug. The 48 or more trials still underway include at least 17 that are testing whether it could still play a role as a prophylactic preventing COVID-19 infection, even if it may not help treat patients who are already infected with the coronavirus.

On Wednesday, the New England Journal of Medicine published the results of a University of Minnesota trial that showed the drug did not help prevent COVID-19 trial in patients who were already exposed to the virus.

Dr. Bradley Connor, the lead investigator for The New York Center for Travel and Tropical Medicine’s trial, was undeterred by the Minnesota results. “Science is based on multiple studies. This doesn’t change anything.”