Science

The Food and Drug Administration has authorized two malaria — chloroquine and hydroxychloroquine — to be added to the national emergency stockpile for use in responding to COVID-19. Photo Illustration by John Phillips/Getty Images hide caption

The logo of the World Health Organization (WHO) at its headquarters in Geneva. The organization says the coronavirus is primarily transmitted "through respiratory droplets and contact routes," not airborne transmission. Fabrice Coffrini/AFP via Getty Images hide caption

Universities across the U.S. are gearing up to run coronavirus tests, much like the virology lab at UW Medicine, which includes the University of Washington's medical school and hospitals, started doing early on in the outbreak. John Moore/Getty Images hide caption

The German icebreaker Polarstern is moored to a piece of ice, drifting for a year, as scientists study the warming Arctic. Ravenna Koenig/Ravenna Koenig hide caption

Three of Wells' 3D printers at work in his makeshift office. Elliot Wells/Elliot Wells hide caption

Even some of the darkest, wettest parts of the Australian landscape burned during the country's fire season. The incursion of fire into these damp refuges alarms ecologists like Mark Graham. Nathan Rott/NPR hide caption

The Centers for Disease Control and Prevention says there's no evidence that pets can contract or spread the coronavirus. But you still may want to keep your dog away from other people right now. Max Posner/NPR hide caption

Doctors test hospital staff with flu-like symptoms for the coronavirus outside the Emergency Department at St. Barnabas Hospital in the Bronx. Not all New York City hospitals are able to do coronavirus tests on-site. Misha Friedman/Getty Images hide caption

The mouthpiece of a CPAP (continuous positive airway pressure) device delivers enough pressurized air to keep the breathing passage of someone who has obstructive sleep apnea open throughout the night. Dr P. Marazzi/Science Source hide caption

Dr. Deborah Birx, who coordinates the White House Coronavirus Task Force, criticized a test "where 50% or 47% are false positives" at a briefing on March 17. Kevin Dietsch/UPI/Bloomberg via Getty Images hide caption

The Pike Place Market is nearly empty in downtown Seattle on March 10. John Moore/Getty Images hide caption

Regeneron Pharmaceuticals, headquartered near Tarrytown, N.Y., is just one of the companies now working to identify and reproduce large quantities of antibodies that could prevent or treat COVID-19. Senior R&D Specialist Kristen Pascal works on COVID-19 research for Regeneron. Rani Levy/Regeneron Pharmaceuticals hide caption

President Trump's letter to U.S. governors about the coronavirus. The White House hide caption

After the Food and Drug Administration granted Gilead Sciences orphan drug status for its experimental drug remdesivir on Tuesday, Gilead asked that the agency rescind that status Wednesday. Bloomberg/Bloomberg via Getty Images hide caption

President Trump takes questions from reporters Monday. Joining him at the press briefing on coronavirus are Vice President Pence; Attorney General William Barr; Dr. Deborah Birx, White House coronavirus response coordinator; and Navy Rear Adm. John Polowczyk, who leads FEMA's task force on the supply chain. Alex Brandon/AP hide caption

Gilead Sciences CEO Daniel O'Day (center) took part in a meeting of the White House Coronavirus Task Force on March 2. Andrew Harnik/AP hide caption