Hundreds of people are rolling up their sleeves in countries across the world to be injected with experimental vaccines that might stop COVID-19, spurring hope — maybe unrealistic — that an end to the pandemic may arrive sooner than anticipated.

State and local governments across the United States have obtained about 30 million doses of a malaria drug touted by President Trump to treat patients with the coronavirus, despite warnings from doctors that more research is needed.

The U.S. Food and Drug Administration on Friday warned doctors against prescribing a malaria drug touted by President Donald Trump for treating the new coronavirus except in hospitals and research studies.