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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

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Photo Illustration by John Phillips/Getty Images

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

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Fabrice Coffrini/AFP via Getty Images

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

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John Moore/Getty Images

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

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Nathan Rott/NPR

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

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Max Posner/NPR

US President Donald Trump signs the CARES act, a $2 trillion rescue package to provide economic relief amid the coronavirus outbreak, at the Oval Office of the White House on March 27, 2020. Jim Watson/AFP via Getty Images hide caption

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Jim Watson/AFP via Getty Images

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

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Misha Friedman/Getty Images

David Biello Elizabeth Zeeuw / TED hide caption

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Elizabeth Zeeuw / TED

David Biello: A Journey Into Uncharted Territory

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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

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Dr P. Marazzi/Science Source

(At left) A colorized electron micrograph image of the influenza virus. (At right) Color-enhanced electron micrograph image of SARS-CoV-2 virus particles, isolated from a patient. Science Source hide caption

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Science Source

No, The Coronavirus Isn't Another Flu

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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

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Kevin Dietsch/UPI/Bloomberg via Getty Images

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

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Rani Levy/Regeneron Pharmaceuticals

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

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Bloomberg/Bloomberg via Getty Images

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

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Alex Brandon/AP

Nalini M. Nadkarni is a professor of biology at the University of Utah. Sybil Gotsch hide caption

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Sybil Gotsch

The nearly empty baggage claim area at McCarran International Airport in Las Vegas on March 19, 2020. Ethan Miller/Getty Images hide caption

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Ethan Miller/Getty Images