Three critically ill patients at Baptist Hospital in Miami were the first in the U.S. to be successfully treated with stem cells.

The patients were suffering from acute respiratory distress syndrome, or ARDS, and doctors infused them intravenously with cells derived from the lining of umbilical cords.

These are called mesenchymal stem cells and within days after the infusion, the patients who needed 100% oxygen on ventilator support, saw their requirement slashed in half. This significant reduction was also accompanied by a drop in inflammatory markers, meaning that the harmful inflammation crippling the lungs was not only arrested but reversed, according to Baptist Health South