Dr. Gopi Patel recalls how powerless she felt when New York's Mount Sinai Hospital overflowed with COVID-19 patients in March.

Guidance on how to treat the disease was scant, and medical studies were being performed so hastily they couldn’t always be trusted. "You felt very helpless,” said Patel, an infectious disease doctor at the hospital. "I’m standing in front of a patient, watching them struggle to breathe. What can I give them?”

While there is still no simple answer to that question, a lot has changed in the six months since an entirely new coronavirus began sweeping the globe.